AutoMeter BVA-34 User manual

®
OPERATOR’S
MANUAL
Quality Test Equipment Since 1957
ANALYZER

Congratulations! On your new purchase of Auto Meter’s Charging/Starting System
Analyzer. It is designed to test each component of a vehicle’s electrical system with speed and
accuracy. If you should have any questions about your tester or the testing procedures, please
give us a call at [phone].
Controls and Functions . . . . . . . . . . . . . . . . . . . . . . . . . 1
Orientation / Maintenance . . . . . . . . . . . . . . . . . . . . . . . 2
Basic Tests:
A. Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
B. Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
C. State of Charge Battery Load Test . . . . . . . . . 4
D. Hook-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
E. Starting System . . . . . . . . . . . . . . . . . . . . . . . 6
F. Charging System Overview . . . . . . . . . . . . . . 8
G. Regulator Bypass Test (Full Field) . . . . . . . . . 9
H. Volt Regulator Test . . . . . . . . . . . . . . . . . . . . 10
I. Amp Draw Test . . . . . . . . . . . . . . . . . . . . . . . 10
J. Voltage Drop Tests (for starting systems) . . . 11
K. Voltage Drop Tests (for charging systems) . 12
Appendices:
IBattery Charging Guide . . . . . . . . . . . . . . . . 13
II Troubleshooting Tester Trouble . . . . . . . . . . 13
III Regulator Bypass Connections . . . . . . . . . .15
Warranty and Service Information . . . . . . . . . . . . . . . .30
CONTENTS
Load Test Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 800 Amp
Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . Two Digital, 3⁄4” Characters
Amp Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Digital, 0-1200
Volt Ranges . . . . . . . . . . . . . . . . . . . . . . . Digital, 0-19.99, 20.0-199.9
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5” Internal Fan
Leads . . . . . . . . . . . . . . . . . Load Amp/Volt-10 ft., 2 Gauge/18 Gauge
(2 Conductor)
Inductive Amp Probe-10ft.
Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101⁄2” x 9” x 91⁄2”
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 lbs.
Finish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Red Powder Paint
Stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ES-1 (Optional)
SPECIFICATIONS
ANALYZER

3
LOAD ON LIGHT
indicates load is
being applied.
INDUCTIVE AMP PROBE
(Detachable)
measures amperage when clamped
over any current carrying vehicle wire.
Arrow should point in the direction of
current flow for correct polarity.
ZERO AMPS
used to zero
ammeter.
START TIMER initiates the
15 second timer light when
pushed, then released.
LOAD CONTROL KNOB controls the
amount of load applied to batteries.
(Do not exceed the 15 second
maximum load time)
INDICATOR LIGHT when used
in conjunction with the start
timer button, indicates when 15
seconds has elapsed.
VOLTS SELECTOR SWITCH
switches volt reading from internal
battery clamps to external volt leads
COAXIAL CLAMP
LEADS connects the
unit to the battery and
voltmeter for testing
as well as provides
power for the unit.
Red for positive and
black for negative.
EXTERNAL VOLT LEADS
used for reading voltage in hard
to reach places where higher
voltages are present, and
voltage drop testing.
CONTROLS AND FUNCTIONS
STATOR DIODE LIGHT
indicates one or more bad diodes
in an alternator-based system.

4
ORIENTATION / MAINTENANCE
If tester has not been used for awhile, moisture
may have condensed between carbon pile discs.
This will cause the tester to steam a little during
first or second load application. This is normal and
is not a malfunction of the tester. Do not confuse
this with an overloading of the tester.
TESTER DUTY CYCLE:
To reduce wear and tear on the tester and to
avoid overheating the carbon pile, the following
duty cycle should be followed:
15 seconds on... 45 seconds off
Excess loading of the carbon pile without a
“cooling off” period could cause damage.
TESTER CARE AND
MAINTENANCE
n Do not lay the inductive Amp probe on
hot surfaces (ie. engine manifolds, etc.)
Overheating can cause damage to the Probe.
n Keep probe & clamp surfaces clean, free of dirt
and oil.
n Keep leads free of oil. Clean with warm, soapy
water.
n Never insert an object into the fan vents.
This can cause electrical and/or mechanical
damage. Never cover the fan vents to allow for
proper cooling of the tester.
n Never attempt to open up or repair the tester.
Repairs should only be done by an authorized
repair center. NOTE: Doing so could void the
warranty.
n Do not disable the auto unload feature.
n Do not disable the auto unload feature. Always
verify the load knob is off before disconnecting
tester. Accidently connecting/disconnecting the
clamps to a battery with the load on can be very
dangerous.
WARNING
BE SURE LOAD IS OFF BEFORE
DISCONNECTING TESTER.

5
SAFETY
A
INSPECTION
B
SAFETY PRECAUTIONS:
Carefully read all operating instructions before using.
Wear eye protection when working around batteries.
Load knob must be off before attaching or removing load clamps
to prevent arcing and potential explosion.
Keep sparks, flames or cigarettes away from batteries.
Keep hair, hands, and clothing as well as tester leads and cords
away from moving blades and belts.
Provide adequate ventilation to remove car exhaust.
In extremely cold temperatures, check for frozen electrolytic fluid
before applying load.
Never connect large leads of this unit to more than a 12V battery.
Connection to 24 volts will dangerously overload the carbon pile
and circuitry. To test 24 volt systems see “D”.
VISUAL ChECk
Inspect and correct any frayed, glazed, cracked or
loose belts; cracks in battery case; loose or broken posts;
loose hold downs; low electrolyte level; corrosion on
terminal; Wet area around terminals.
Inspect starter, solenoid, and regulator for: Loose
connections, loose mounting of components, and frayed
or cracked wires.
STATE OF ChARGE
1. OPEN CELL BATTERIES- Using a hydrometer,
check the specific gravity of the electrolyte fluid. Typical
specific gravity values are as follows.
Reading Of: Indicates Battery Is:
1.265 100% Charged
1.225 75% Charged
1.190 50% Charged
1.155 25% Charged
These specific gravity values are applicable to an
electrolytic temperature of 80°. The values must be
adjusted for temperatures other than 80°, to do this: Add
.004 for every 10 increments over 80°. Example: At 90°
1.265 +.004 =1.269. Subtract .004 for every 10° under
80°F. Example: at 70° 1.265 - .004 = 1.261.
Specific gravity must be 1.225 or above. If low, charge
per battery manufacturers specifications. Apply
a load equal to 1/2 cold crank amp rating for 5 seconds to
remove surface charge.
There should not be more than 50 points spread
between cells. If more than 50 points, replace battery.
2. SEALED TOP BATTERIES- (Maintenance Free)
Battery must be at 12.4 volts or above before testing. If
below 12.4, charge battery (See Appendix A) and apply
a load equal to 1/2 cold crank rating load for 5 seconds
to remove surface charge. Cold crank rating is explained
under section “C” Battery Load Test. If battery reads less
than 12.4 volts after recharging, replace battery. (6.2 volts
for 6 volt batteries)
IMPORTANT NOTE: A defective battery must be
replaced before proceeding.
Valid automotive electrical system testing depends on
all the components being in good operating condition.
In addition, the battery MUST have sufficient charge
for testing. Carefully perform the following before
attempting any electrical diagnosis. 1. Visual Check
and 2. State Of Charge.
A FURThER LOOk...
CAUSE OF BATTERY FAILURE.
1. INCORRECT APPLICATION: Wrong size battery
may have inadequate cold cranking rating for
original vehicle specifications.
2. INCORRECT INSTALLATION: Loose battery hold-
downs cause excessive vibration which can result
in damage to the plates.
3. IMPROPER MAINTENANCE: Low electrolytic fluid
and corrosion on battery connections, can greatly
reduce battery life and affect battery performance.
4. AGE OF BATTERY: If the date code on the battery
indicates it is fairly old, the failure may be caused
by natural causes.
5. OVERCHARGING: Overcharging caused by a
high voltage regulator setting or incorrect battery
charging can cause excessive gassing, heat and
water loss.
6. UNDERCHARGING Undercharging caused by a
faulty charging system or low voltage regulator
setting can cause lead sulfate to gradually build up
and crystalize on the plates greatly reducing the
battery’s capacity and ability to be recharged.
STATE OF CHARGE
VISUAL CHECK
A. SAFETY
Minimum
1.225
See “C” for tester hook-up.
Inspect For:
Frayed, glazed,
cracked or loose belt.
OPEN CELL
BATTERY SEALED TOP BATTERY
Wet area
around
terminals
Corrosion on
terminals
Loose hold
downs
Loose or
broken posts
OR
OFF LOAD
V
O
L
T
S
V
O
L
T
S

6
A FURThER LOOk...
vOLTAgE ChART
Estimated Minimum Required
Electrolyte Voltage
Temperature Under 15 Sec. Load
12V 6V
70°F Above 9.6 4.8
60°F 9.5 4.75
50°F 9.4 4.7
40°F 9.3 4.65
30°F 9.1 4.55
20°F 8.9 4.45
10°F 8.7 4.35
0°F 8.5 4.25
MULTIPLE BATTERY
SYSTEM TESTS
For multiple batteries, the battery to be tested must be
disconnected from all others.
BATTERY LOAD TEST
C
1. Hook-up for battery load test. (Individually) Be sure
load is off before connecting. Do not connect tester to
more than a 12 volt battery. To avoid sparks, connect
negative lead to battery first and then connect positive
lead. Multiple batteries must be disconnected and
tested individually.
2. Set volts switch to internal setting.
3. Apply a load equal to 1/2 cold crank rating to battery
(or 3x amp hour rating).
Example: Cold crank rating 500 CCA ÷ 2 = 250 amp
load. Amp hour rating: 90 amp hours x 3 =270 amp
load. Apply recommended load by turning load knob
slowly clockwise. Push button for 15 second timer,
indicator light will off. The recommended load must be
maintained for the duration of the 15 seconds in order
to accurately test the battery. The amperage will tend
to drop as a normal reaction to the gradual decrease
in voltage so the load must gradually be increased by
turning the load knob clockwise. Indicator light will turn
off after 15 seconds. Observe voltage reading.
4. Estimate the temperature of the electrolyte fluid when
reading the pass/fail scale. The amount of voltage a
battery can maintain when a load is applied decreases
as the temperature decreases. Use the voltage chart
at right to determine the correct minimum voltage. If
voltage level was below specifications, battery should
be replaced (or charged and retested). If voltage level
was above specifications, battery is O.K.
5. Verify that the load is off before disconnecting tester.
A Battery must be able to turn over (crank) an
engine while maintaining enough current to activate
the ignition system. Batteries should be able to
maintain 9.6 volts with an elecrolytic temperature of
70° when a recommended load is applied.
1. HOOK-UP FOR
BATTERY LOAD TEST
2. ZERO
AMMETER
(IF NECESSARY)
3. LOAD BATTERY 4. READ
VOLTS
5. TURN OFF
LOAD
LEAVE THE COOLING FAN ON
FOR 15 SECONDS, WITH LORD
OFF TO REDUCE OVER HEATING.
WARNING
BE SURE TO TURN FAN
& CIRCUIT OFF BEFORE
DISCONNECTING TESTER.
WARNING
BE SURE LOAD IS OFF BEFORE
DISCONNECTING TESTER.
·
arrow on probe
BLACK RED
battery
OFF LOAD
OFF LOAD
A
M
P
S
V
O
L
T
S
3. TIMER
PRESS BUTTON
TO START 15
SECOND TIMER
START
*
To test a 6 volt battery with a CCA above 800 amps. Apply a load equal to 1/4 the CCA rating or 1.5 times the amp hour rating.
Maintain the load to 30 seconds by pressing the timer button a second time immediately after the green LED turns off.
*

7
TESTER hOOk-UP
STARTING SYSTEM OVERVIEW
D
IMPORTANT:
n Both jaws of each clamp must firmly engage battery terminal.
Take special care when testing side terminal batteries.
n If tester has volt reading but will not load, there is a poor
connection on the siver jaw of the clamp.
n If tester has no volt reading but will load, there is a poor
connection on the copper jaw of the clamp.
n For 24 volt system hook-up, set volt switch to external and
use external leads to read voltage
WARNING:
n Be sure load is off before connecting.
n To avoid sparks connect negative lead first then positive.
n Do not connect large load clamps to more than 12 volts.
n After letting tester warm-up for one minute, zero ammeter
before connecting Inductive Amp Probe.
n When connecting Inductive Amp Probe be sure it contains all wires on
negative terminal; arrow on Inductive Amp Probe should be pointing toward
the engine ground (away from the battery).
Assuring proper hook-up of the tester to the vehicle is
essential to the accuracy of the test results.
A FURThER LOOk...
The large load leads power the tester as well as
measure voltage (internally). Keep large load leads
connected to 12 volts and use the smaller voltage leads
to measure higher voltage systems. Turn volt switch to
the external position.
The sole purpose of the starting system is to turn over (crank) the engine fast enough for the engine to fire and run on its own. It is composed of a
starter motor, a magnetic switch (usually a solenoid), a battery, an ignition switch, and usually a starting safety switch.
It is divided into two circuits: the starter circuit, and the control circuit. The starter circuit supplies high amperage current to the starter motor
through the solenoid. The control circuit provides low amperage current to the solenoid when the ignition switch is turned to the start position.
When current is supplied, the starter turns the crankshaft flywheel. The E. STARTER DRAW TEST measures how much current the starter is
drawing. If the starter draws too much current, there is a problem with the starter. If the starter draws too little current, there is probably too much
resistance in the circuit or the solenoid is defective. Either of these low draw problems can be pinpointed using the J. VOLTAGE DROP TEST.
DIAGNOSING THE PROBLEM
Be sure to visually check the battery, all cables and
connections, and belt conditions and tensions before
proceeding (see tests B and C).
BATTERY
-- +
AMMETER
SOLENOID
STARTING MOTOR
TRANSMISSION
NEUTRAL SWITCH
REPLACE STARTER
REPAIR / REPLACE SOLENOID
J. VOLTAGE DROP TEST
E. STARTER DRAW TEST
AMPS OUT OF
SPECIFICATION
AMPS HIGH AMPS LOW
AMPS WITHIN
SPECIFICATION
AMPS WITHIN
SPECIFICATION
INTERNAL
SOLENOID
REPEAT
E. STARTER DRAW TEST
EXTERNAL
SOLENOID
IMPORTANT 12 VOLT SYSTEM WITH 6
VOLT BATTERIES
12 VOLT SYSTEM WITH 12
VOLT BATTERIES
24 VOLT SYSTEM WITH 12
VOLT BATTERIES
IMPORTANT:
Inductive Amp
Probe must contain
all wires on negative
terminal.
IMPORTANT:
Inductive Amp
Probe must
contain all wires on
negative terminal.
IMPORTANT:
Inductive Amp
Probe must
contain all wires on
negative terminal.
STARTING SYSTEM SYMPTOMS POSSIBLE CAUSES
Starter does not crank engine Defective solenoid
Open circuit
Discharged battery
Starter cranks engine too slowly Excessive resistance
Defective starter
Starter rotates but does not crank engine. Defective starter drive
Excess engine bearing wear
SET VOLT SWITCH TO INTERNAL SET VOLT SWITCH TO INTERNAL SET VOLT SWITCH TO EXTERNAL
VOLT JAW
AMP JAW
Chassis
ground Engine ground
Arrow on probe
black
6V
Battery
red
·
6V
Battery
12V
Battery 12V
Battery
black red
Chassis
ground Engine ground
Arrow on probe
·
black red
12V
Battery 12V
Battery
Chassis
ground Engine ground
Arrow on probe
·
SYSTEM IS O.K.
REPAIR / REPLACE DEFECTIVE
CABLES AND CONNECTIONS

8
STARTER DRAW TEST ChARGING SYSTEM OVERVIEW
E
The starter draw test measures the amount
of current needed to crank the engine which
provides the initial information to diagnose
and/or further test the starting system if
necessary.
1. HOOK-UP
TESTER
3. DISABLE
IGNITION
4. CRANK
ENGINE
5. READ AMPS2. ZERO
AMMETER
(IF NECESSARY)
See “D” Tester
Hook-up
Crank engine for
3-5 secs.
Jumper Wire
Battery Positive Wire
Harness Connector
Distributor
Cap
A FURThER LOOk...
STARTINg SYSTEM
What may appear to be a major problem may turn out
to be a minor problem such as a loose or corroded
connection. As mentioned previously, always check
the battery, and starter/solenoid for visual defects.
In addition to this, be sure check the ignition switch
and any magnetic switches for the following: Loose
mounting or connections. Bad wiring. Sticking contacts.
4 Cyl Gas 4 Cyl Dsl 6 Cyl Gas 6 Cyl Dsl 8 Cyl gas 8 Cyl Dsl
120-250 up to 350 up to 250 up to 450 up to 250 up to 650
1.Tester hook-up see instruction ‘D” for hook-up.
2. Set volts switch to internal volt setting.
3. Disable ignition system to prevent engine from starting
when cranking.
On standard and electronic ignition: disconnecting the
power supply can be done using one of two methods:
n For point type ignitions
remove coil wire from
distributor tower and
securely ground it.
nFor electronic ignitions
disconnect power to the
ignition by disconnecting
it from the wiring harness.
On diesel vehicles: Disconnect
the fuel shut-off solenoid. On
Ford Motor Company vehicles
it may be possible to disable
the inertia switch which is
typically located in the
trunks on cars and under
the dashboard on trucks
and vans.
nCheck with manufacturer’s
proper procedure to disable
ignition. Improper method
could cause damage to
vehicles that are computer controlled.
4. Crank engine: Note the starter sound, does it sounds
sluggish? NOTE: A remote starter switch can be used
to bypass the ignition switch and “crank” the engine
from under the hood.
5. Read amps:
n Observe amp meter reading, if within
specifications,starter system is O.K. If manufacturers
specifications are not available the chart below can
be used as a general guideline.
If out of specifications:
n Check cables and connectors for excessive
voltage drop. See section J. VOLTAGE DROP TEST
n Repair or replace any defective cables or connectors.
n Retest system
If still out of specifications:
n A high amp reading indicates a faulty starter.
Some possible causes are shorted windings, bent
armature, broken housing or bad bearings.
Repair and replace starter as needed.
n A low amp reading (under 150 amps) indicates a faulty
solenoid. Repair or replace solenoid as needed.
Multiple battery systems:
n If more then one positive cable connects directly to the
starter the individual amp readings from each cable
must be added together to determine starter draw.
(For truck, bus, and other heavy-duty engines and
starters, refer to manufacturer’s specifications.)

9
STARTER DRAW TEST ChARGING SYSTEM OVERVIEW
When the engine is operating, the charging system converts mechanical energy into electrical energy to supply all of the car’s electrical systems
as well as to maintain the battery at full charge. The main components of the charging system are: an alternator (or generator), a regulator, a
battery, an in-dash indicator, and the wiring.
The alternator generates a certain level of amperage depending on the vehicle’s needs. The amperage output rating is usually stamped on the
alternator housing. If the alternator is faulty, the maximum amp output will be low. The F. ALTERNATOR OUTPUT TEST measures this output.
The test also indicates the presence of any open diodes in the system.
The alternator must be limited in order to not supply more voltage than needed which could cause excessive wear and damage to the electrical
system.This is accomplished by the regulator which can be either internal (inside the alternator) or external. All external and some internal
regulators can be bypassed in the G. REGULATOR BYPASS TEST (FULL FIELD) to determine if low voltage is caused by the alternator or
regulator. The H. VOLTAGE REGULATOR TEST should also be done to insure that the regulator is maintaining the proper amount of voltage after
the car has warmed up.
Loose or corroded terminal, connections and damaged or undersized wires can produce resistance which can cause the voltage to drop between
charging system components. The J. VOLTAGE DROP TEST can pinpoint the source of these problems.
DIAGNOSING THE PROBLEM
Be sure to check the battery, all cables and connections, and belt
condition and tension before proceeding (see tests B and C)
CHARGING SYSTEM SYMPTOMS
n Ammeter, voltmeter, or
warning light indications.
n Battery has low state of charge.
n Alternator noise.
H. VOLTAGE
REGULATOR TEST
G. REGULATOR
BYPASS TEST
F. ALTERNATOR OUTPUT TEST
READING OK
OUTPUT OK OR LOW
LED ON
READING LOW
OUTPUT LOW
OUTPUT OK OR
LED OFF
INTERNAL
REGULATOR
J. VOLTAGE DROP TEST
ON CHARGING SYSTEM
EXTERNAL
REGULATOR
LED OFF
Ignition
Regulator
Alternator
Battery
Voltmeter
Field Circuit
Battery Circuit
REPLACE ALTERNATOR
ADJUST OR REPLACE
REGULATOR
REPAIR / REPLACE WIRING AND
CONNECTIONS AS NECESSARY REPLACE ALTERNATOR

10
ALTERNATOR OUTPUT TEST
F
This test accurately measures the maximum output of
the alternator under maximum load conditions. This
information provides the basis for further charging
system tests. It also detects the presence of an open
diode which causes an output loss of several amps
and can cause the failure of other diodes.
A FURThER LOOk...
ALTERNATOR TERMINALS
DELCO REMY- 10 SI
“BAT” = Alternator output to + battery.
“No. 1” = Battery current to rotor winding.
“No. 2” = Alternator output from battery.
DELCO REMY- 10 DN
“Bat” = Alternator output to + battery.
“GRD” = Additional ground
“R” = Indicator lamp
“F” = Rotor winding to regulator
MOTORCRAFT-Rear terminal
“BAT”= Alternator output to + battery
“STA” = Starter to various units including indicator lamp.
“FLO” = Rotor winding to regulator
“GRD” = Ground
SIDE TERMINAL:
Same except “STA” connects to rectified alternator
output.
CHRYSLER:
“BAT” = Alternator output to + battery.
“GRD” = Ground
(2) “FLD” = Connects to 2 insulated brushes
1. Tester hook-up see instruction “D” for hook-up.Turn
ignition on and read key draw before starting.
2. Start engine, idle at approximately 2000 rpm or to
manufacturers test rpm.
3. Slowly apply load. Adjust load to obtain maximum
alternator output on the amps scale. Do not allow
voltage to drop below 12 volts or 24 volts on 24
volt systems. Use vehicle accessories if necessary to
aid in applying load.
4. Check stator diode LED: If LED is on continuously, diode
or stator is bad. Replace alternator. A bad or “open”
diode or open stator windings can cause a slight drain
on alternator output as well as causing other diodes to
fail. This could eventually result in a failed regulator or
dead battery.
NOTE: LED may flash during transient loading, only a
steady light indicates a defect.
5. Read maximum amp output of alternator and remove
load. Add key draw reading to alternater output.
Output should be within 10-15% of manufacturers
specifications.
n If output is O.K. go to voltage REGULATOR TEST
STEP H.
n If output is low on the external regulator go to
REGULATOR BYPASS TEST STEP G
n If output is low on the internal regulator replace
alternator.
NOTE: Check alternator for correct size pulley. (Too large
may account for low output.)
n Inductive Amp Probe in many cases might have to
be placed on the output wire of the alternator to read
maximum output.
STATOR
DIODE
A
M
P
S
1. HOOK-UP
TESTER
2. ZERO
AMMETER
(IF NECESSARY)
4. SLOWLY
APPLY LOAD
5. CHECK
STATOR DIODE
LED
6. READ MAX.
AMP OUTPUT OF
ALTERNATOR. THEN
TURN OFF LOAD.
3. TURN ON
KEY AND
READ KEY
DRAW (AMPS)
THEN START
ENGINE.
See “D” Tester Hook-
up
OFF LOAD

11
REGULATOR BYPASS TEST (FULL FIELD)
G
When a charging system has low voltage output
either the alternator, regulator or the wiring in the
system could be at fault. The regulator bypass test
helps pinpoint the problem. If the alternator output is
normal after bypassing the regulator, the regulator is
defective. If the alternator output remains low after
bypassing the regulator, the alternator is defective.
A FURThER LOOk...
FIELD CIRCUIT TYPES:
TYPE “A” field circuits are grounded externally through
the regulator contacts.
Type “B” field circuits are grounded internally through
the alternator.
1. Hook-up tester. See step “D” for tester hook-up.
2. Set volts switch to internal setting.
3. Refer to Appendix IV for the proper way to bypass
regulator. Full Field Adaptor Kit or equivalent is
recommended.
4. Start engine and slowly apply load, while running engine
at fast idle to maintain voltage level shown below.
System Voltage Range
12 Volts 12-15 Volts
24 Volts 24-30 Volts
Caution: To prevent damage to vehicle electrical circuits;
do not let voltage rise above 15 volts for 12 volt
systems or 30 for 24 volts.
The alternator is un-regulated, and full output should be
attained. If not replace alternator.
WARNING: Monitor voltage continiously from engine start.
DO NOT exceed safe MAX Voltage. Turn off engine to
avoid possibility of electrical damage to vehicle.
1. ZERO
AMMETER
(IF NECESSARY)
2. FULL FIELD ALT
(Use Full Field Adaptor)
3. START
ENGINE
4. SLOWLY
APPLY LOAD
5. READ MAX
AMP OUTPUT
OF ALT.
See “D” Tester
Hook-up
Volt Reg.
Field Term Plug.
Tester Full
Field Lead
A
M
P
S
COMPARE TO VEHICLE SPECS.
IF LOW: REPLACE ALTERNATOR
IF OK: REPLACE REGULATOR
IF PREVIOUS: RESULTS WERE LOW
WARNING
BE SURE LOAD IS OFF BEFORE
DISCONNECTING TESTER.
TURN LOAD OFF
WARNING
BE SURE LOAD IS OFF BEFORE
DISCONNECTING TESTER.
OFF LOAD

12
VOLTAGE REGULATOR TEST
h
The voltage regulator test can
be performed as a continuation
of the alternator output test. It
provides a means of assuring
that the regulator is suppling
the proper amount of voltage
after the car has warmed up.
(the initial amperage draw has
tapered off and the battery is
charged).
A FURThER LOOk...
Overcharging caused by improper regulator setting is
a major cause of premature battery failure. Make sure
regulator is within specifications.
Voltage Regulator Setting at 70°.
13.6 - 13.8 V for conventional batteries.
13.9 - 14.1 V for maintanace free batteries.
1. Hook-up tester. See step “D” for tester hook-up.
2. Start engine and read voltage
Make sure all accessories are turned off.
Keep engine speed at approximately 2000 - 2500 rpm.
Read volts after amps fall to 10 amps or less (with
battery charged).
NOTE: Voltage regulators are temperature sensitive
to provide adequate voltage needed at various
temperatures. Measure the temperature near the
regulator (A common meat thermometer will work).
Check manufacturers specifications for temperature
compensated voltage requirements.
If voltage is within manufacturers specifications:
system is good.
If voltage is outside of manufacturers specifications:
nAdjust regulator to correct voltage. If factory
specifications are not available, use chart in
“A Further Look” for general voltage requirements.
nRetest- If out of specifications, check
AMP DRAW TEST
I
Faulty wiring can cause
current draw even when
all accessories are off, this
current leakage can cause
substantial battery drain.
This test pinpoints any
current leakage.
1. Hook-up tester. See step “D” for tester hook-up.
2. Attach Inductive Amp Probe to circuit wire. Arrow on
probe should point in direction of current flow. Be sure
all accessories are off (including clock and underhood
light).
regulator ground and repair if necessary.
(Check for loose or corroded connectors).
nRetest- If reading is unsteady, erratic, or will
not adjust. Replace regulator.
n Observe ammeter.
n If reading is present, current is being drawn.
Locate draw and repair.
n If no reading is present there is no
current leakage.
A
M
P
S
V
O
L
T
S
1. HOOK-UP
TESTER & ZERO
AMMETER
(IF NECESSARY)
2. START
ENGINE
3. READ
VOLTAGE
See “D” Tester Hook-
up
1. HOOK-UP
TESTER & ZERO
AMMETER
(IF NECESSARY)
2. PLACE INDUCTIVE AMP
PROBE ON CIRCUIT WIRE.
See “D” Tester Hook-
up
Arrow should
point in direction
of current flow for
correct polarity.

13
VOLTAGE DROP TEST (FOR STARTING SYSTEMS)
J
Loose or corroded terminal connections and damaged
or undersized wires can produce resistance which
causes the voltage to drop between starting system
components. Using the following procedure, volt
readings can be taken of each part of the circuit and
then compared to the voltage of a normal circuit,
pinpointing voltage drops.
1. Hook-up tester. See following diagrams for hook-up.
NOTE: The Inductive Amp Probe is connected to a load
lead of the tester.
2. Set volt selector switch as indicated in the diagram.
3. Hook-up external leads to the part of the circuit being
tested (see following diagrams for specific hook-up).
4. Load starter circuit to approximate starter draw
specification.
5. Read Voltage.
STARTER SYSTEM gROUND CIRCUIT
TURN VOLT SWITCh TO EXTERNAL - READ VOLTAGE DROP
STARTER SYSTEM INSULATED CIRCUIT
TURN VOLT SWITCh TO EXTERNAL - READ VOLTAGE DROP
24 VOLT SYSTEMS MUST BE CONNECTED TO A TEMPORARY 12 VOLT CONNECTION
OvERALL STARTINg SYSTEM
TURN VOLT SWITCh FROM INTERNAL TO EXTERNAL
Visually check for:
n Loose or corroded
connections.
n Frayed or undersized
wires.
n Bad contacts on the
solenoid.
Visually check for:
nLoose starter
mounting bolts.
n Bad battery ground
terminal.
n Damaged or under-
sized grounding cable
from the battery to the
engine block.
ACCEPTABLE LEVELS
If drop is .5V or less, circuit
is OK. If drop is more than
.5V, repair circuit. Proceed
to step 3.
ACCEPTABLE LEVELS - LESS THAN .5 VOLTS
Subtract internal voltage from
external voltage. If more
than a .5 volt drop,
proceed to step 2 & 3
to locate which circuit
has high resistance.
ACCEPTABLE LEVELS
If drop is .2V or less, circuit is
OK. If drop is more
than .2V, repair circuit -
proceed to step 1 to
check repairs.
Black
Black
Starter
Solenoid
Battery
Red
Red
G
++
+
G
G
Black
Black
Solenoid
Battery
Red
Red
Black
Black
Starter
Starter
Solenoid
Battery
Red
Red
12
3

14
n If the amount of voltage drop is at or below the amount
specified: that part of the circuit is functioning properly.
n If the amount of voltage drop is above the amount
specified: move the leads progressively across each
section of the circuit until the defective section is found.
n If the voltage level is within the specified levels: charging
system does not have resistance problems.
n If voltage drop is more than the specified levels:
individually check each section of the charging system.
nIf drop exceeds maximum level, proceed to determine
which circuit may have a high resistance.
VOLTAGE DROP TEST (FOR ChARGING SYSTEMS)
k
OvERALL ChARgINg SYSTEM
TURN VOLT SWITCh FROM INTERNAL TO EXTERNAL
24 VOLT SYSTEMS MUST BE CONNECTED TO A TEMPORARY 12 VOLT CONNECTION.
ChARgINg SYSTEM INSULATED CIRCUIT
TURN VOLT SWITCh TO EXTERNAL - READ VOLTAGE DROP
Loose or corroded terminal connections and damaged
or undersized wires can produce resistance, which
causes the voltage to drop between charging systems
components. Using the external volt leads, volt readings
can be taken of each part of the circuit and then
compared to the voltage of a normal circuit, pinpointing
the source of resistance problems.
1. Hook-up tester. See following diagrams for hook-up.
NOTE: The Inductive Amp Probe is connected to a load
lead of the tester.
2. Set volt selector switch as indicated in the diagram.
3. Hook-up external leads to the part of the circuit being
tested. (See following diagrams for specific hook-up.)
4. Apply load by turning load knob clockwise. Increase
load until ammeter reads the manufacturers
specification for alternator output.
5. Observe voltage drop reading. NOTE: To check the
overall charging system, turn volts switch to internal.
Subtract the external reading from the internal reading
and compare to manufacturers specifications.
Black
Black
Ext.
Ground
-Neg +Pos
Red
Red
Ext.
12V Battery
Black
Black Ext.
-Neg +Pos
Red
Red
Ext.
Battery
Terminal
Battery
Terminal
12V Battery
NOTE: Subtract external voltage from
internal voltage and compare to
manufacture’s specification.
If more than acceptable, proceed to step 2.
Battery
Terminal
ChARgINg SYSTEM gROUND CIRCUIT
TURN VOLT SWITCh TO EXTERNAL - READ VOLTAGE DROP
Black Black
Ext.
Ground
-Neg +Pos
Red
Red Ext.
12V Battery
OVERALL CHARGING SYSTEM
ACCEPTABLE VOLTAGE DROP LEVELS
American Motors .65 V. Maximum Drop
Chrysler .9 V. Maximum Drop
Ford .8 V. Maximum Drop
General Motors .65 V. Maximum Drop
12
3
ACCEPTABLE LEVELS
If drop is .5V or less: Circuit Is O.K.
If drop is more than .5V...
Visually check for:
n Loose or corroded connections.
n Frayed or undersized wires.
Proceed to step 3.
ACCEPTABLE LEVELS
If drop is .5V or less: Circuit Is O.K.
If drop is more than .5V...
Visually check for:
n Loose or corroded connections.
n Frayed or undersized wires.
After repairs are made, proceed to
step 1 for final test.

15
NOTE: CHARGING RATES VARY
AND DEPEND ON THE:
The battery capacity rating (in minutes):
The higher the rate... the longer the charging
time required.
The degree of discharge:
A fully discharged battery requires 2 x’s as
much charging as 1/2 charged battery.
The battery condition and age:
An old battery and/or one in poor condition
requires more charging time.
The electrolytic temperature:
The colder the temperature...the longer the
charging time required.
CAUTION: Exceeding recommended
charging rates can damage battery plates
and generate potentially explosive gases.
APPENDIX I BATTERY CHARGING GUIDE
APPENDIX II TROUBLESHOOTING TESTER TROUBLE
Recommended charging rates for
fully discharged batteries.
Battery Reserve Charge Battery At:
Capacity (min.) (slow charge on top
fast charge on bottom)
80 minutes or less 14 hrs. at 5 amps
7 hrs. at 10 amps
81-125 minutes 20 hrs. at 5 amps
10 hrs. at 10 amps
126-170 minutes 28 hrs. at 5 amps
14 hrs. at 10 amps
171-250 minutes 42 hrs. at 5 amps
21 hrs. at 10 amps
251 minutes and above 33 hrs. at 10 amps
PROBLEM
Sparks when attaching clamps
to battery
Carbon pile steams
Tester loads but has no volt
reading
Tester has volt reading but
does not load
Inaccurate amps reading
Incorrect ammeter polarity
Incorrect voltmeter polarity
SOLUTIONS
A. Turn load off
B. Turn power switch off
A. Not a problem-will remedy itself
B. Follow duty cycle closely (15 sec.
0n 45 sec. off)
A. Clean battery posts
B. Reposition clamp, both sides of
jaw must make contact
A. Clean battery posts
B. Reposition clamp, both sides of
jaw must make contact
A. Clean jaws
B. Adjust zero knob
A. Turn Inductive Amp Probe around
A. Switch volt leads connections
POSSIBLE CAUSES
A. Load turned on
B. Tester power switch on
A. Moisture in carbon discs
B. Overheating carbon pile
A. Poor connection on copper side of
clamp jaws.
A. Poor connection on silver side od
clamp jaws
A. Dirty Inductive Amp Probe jaws
B. Off zero
A. Inductive Amp Probe wrong direction
A. External volt leads connections
reversed

AUTO METER PRODUCTS, INC.
413 W. Elm St. Sycamore, IL 60178
Toll Free (866) 883-TEST (8378)
Fax [phone]
www.autometer.com
2650-792X-10
Rev. C
LIMITED WARRANTY
(12 MONTHS FROM DATE OF PURCHASE)
The manufacturer warrants to the consumer that this product will be free from defects in material or
workmanship for a period of twelve (12) months from the date of the original purchase (except for carbons
and leads, which are covered for 90 days). Products that fail within this 12 month warranty period will be
repaired or replaced at the manufacturer’s option to the consumer when determined by the manufacturer
that the product failed due to defects in material and workmanship. This warranty is limited to the repair
or replacement of parts in the tester and the necessary labor by the manufacturer to effect the repair
or replacement of the tester. In no event shall this warranty exceed the original purchased price of the
tester, nor shall the manufacturer be responsible for special, incidental or consequential damages or costs
incurred due to the failure of this product. Breaking the meter seal, improper use, accident, water damage,
abuse, unauthorized repairs or alterations voids the warranty. The manufacturer disclaims any liability for
consequential damages due to breach of any written or implied warranty on its tester.
WARRANTY & SERVICE INFORMATION
Warranty claims to the manufacturer’s service department must be transportation prepaid and accompanied with dated proof of
purchase. This warranty applies only to the original purchaser and is non-transferable. Damage incurred during return shipment is not
covered under this warranty. It is the responsibility of the shipper (customer returning tester) to package the tester properly to prevent
any damage during return shipment. Repair costs for such damages will be charged back to shipper (customer return tester). Before
packing tester for return shipment, tighten load knob to prevent breakage of carbon discs during shipment due to rattling. Also, protect
the meters and add plenty of overpack cushioning, such as crumpled up newspaper.