MSD 7AL-2 Plus User manual

Note: Solid Core spark plug wires cannot be used with an MSD Ignition.
Note: An MSD cannot be used on vehicles with CD ignitions or distributorless ignition systems.
Parts Included:
1 - MSD 7AL-2 Plus Ignition 1 - White Wire
1 - Mag Pickup Extension Harness, PN 8860 1 - Red Wire
1 - Mag Pickup Adapter Harness, PN 8859 4 - Vibration Mounts and Hardware
1 - Coil Harness, PN 8863 4 - RPM Modules: 3K, 7K, 8K and 9K
FEATURES
RPM LIMITERS
The 7AL-2 Plus Ignition is equipped with a 2-step rev control. The Ignition will accept two rpm
modules so two different rev limits can be set. One rev limit can be used for overrev protection while
the second limit can be activated on the starting line for a lower rpm limit to assist in staging and
for consistent holeshots. When 12 volts are applied to the 2-step terminal (2’S’), Module 1 is active.
Module 2 is active when there is no 12 volts.
CYLINDER SELECT
This ignition can be used on 2, 4, 6 (even-re) or 8-cylinder engines. The ignition is set for 8-cylinder
operation. To program the unit for other engines, remove the one screw that holds the cover to reveal
three wire loops (Figure 1). Cutting a wire loop determines the cylinder selection.
SPARK LED
When the coil res, current is sensed and this
LED will ash. This conrms that the ignition
has received a trigger signal and that the coil
and ignition are working properly. (If the coil is
not connected, the LED will not ash.) When the
engine is running, it will appear solid.
Cylinders Loops to Cut
8 None
6 One
4 Two
2 Three Cut loops
Remove cap
WARNING: Before installing the MSD Distributor, disconnect the battery cables. When disconnecting
the battery cables, always remove the Negative (-) cable rst and install it last.
Figure 1 Cylinder Programming.
MSD 7AL-2 Plus Ignition
PN 7222/72223
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2 INSTALLATION INSTRUCTIONS
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GENERAL INFORMATION
BATTERY
An MSD 7AL-2 Plus Ignition Control will operate on any negative ground, 12 volt electrical system
with a distributor. The MSD can be used with 16 volt batteries and can withstand a momentary 24
volts in case of jump starts. The Ignitions will deliver full voltage with a supply of 10 - 18 volts and
will operate with a supply voltage as low as ve volts.
If your application does not use an alternator, allow at least 15 amp/hour for every half hour of
operation. If the engine is cranked with the same battery or other accessories such as an electric
fuel or water pump, the amp/hour rating should be higher.
COILS
The MSD 7AL-2 Plus Ignition can be used with many stock coils and aftermarket coils designed to
replace the stock coils such as the Blaster line of coils. For short duration racing, like drag racing,
the MSD Pro Power Coil, PN 8201, is recommended. For use on the street or long duration events,
use coil PN 8251 or PN 8261. For more information on recommended coils, consult the supplied Coil
Application Chart or check with the manufacturer of your coil. If you have any questions concerning
coils, contact our Customer Service Department at [phone].
TACHOMETERS
The MSD Ignition features a Tach Output Terminal on the terminal strip.
This terminal provides a trigger signal for tachometers, a shift light or other
add-on rpm activated devices. The Tach Output Terminal produces a 12
volt square wave signal with a 33% duty cycle.
Some vehicles with factory tachometers may require a Tach Adapter to
operate with the MSD. For more information on Tachometers and MSD
Tach Adapters, see the Tachometer Section on page 6.
If your GM vehicle has an inline lter it may cause the tach to drop to zero
on acceleration. If this occurs, bypass the lter.
SPARK PLUGS AND WIRES
Spark plug wires are very important to the operation of your ignition system.
A good quality, helically wound wire and proper routing are required to get the best performance
from your ignition, such as the MSD Heli-Core or 8.5mm Super Conductor.
Note: Solid Core spark plug wires cannot be used with an MSD Ignition.
A helically, or spiral wound wire must be used. This style wire provides a good path for the spark
to follow while keeping Electro Magnetic Interference (EMI) to a minimum. Excessive EMI, such as
the amount that solid core wires produce, will interfere with the operation of the MSD and other
electronics on your car.
Spark Plug Wire Routing: Correct routing of the plug wires is also important to performance. Wires
should be routed away from sharp edges and engine heat sources. If there are two wires that are
next to each other in the engine’s ring order, the wires should be routed away from each other to
avoid inducing a spark into the other wire. For example, in a Chevy V8, the ring order is 1-8-4-3-
6-5-7-2. The #5 and #7 cylinders are next to each other in the engine and in the ring order. If the
voltage from the #5 wire is induced into #7 detonation could occur and cause engine damage.
To add more heat protection to your plug wires, MSD offers Pro-Heat Guard, PN 3411. This is a glass
woven and silicone coated protective sleeve that you slide over your plug wires. For extra protection
of the spark plug boots, MSD offers Pro-Heat Boot Guard, PN 3412.
TACH
TERMINAL
Figure 2 Tach Terminal.

INSTALLATION INSTRUCTIONS 3
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Spark Plugs: Choosing the correct spark plug design and heat range is important when trying to get
the best performance possible. Since there are so many engine combinations and manufacturers,
MSD does not recommend which plug or gap is exactly right for your application.
It is recommended to follow the engine builder or manufacturer’s specication for spark plugs.
With that, you can then experiment with the plug gap to obtain
the best performance. The gap of the plugs can be opened
in 0.005” increments, then tested until the best performance
is obtained. MSD judges the plug gap by compression and
components:
Note: A larger plug gap taxes the cap, rotor and spark plug
wires. Always inspect the cap and rotor to make sure
they are in good condition.
MISCELLANEOUS INFORMATION
Sealing: Do not attempt to seal the MSD. All of the circuits of an MSD receive a thick conformal
coating of Humi-Seal. This sealant protects the electronics from moisture. If you were to seal the
unit, any moisture or water that may seep in through the wiring grommets will not be able to drain
and may result in corrosion.
Welding: If you are welding on your vehicle, to avoid the chance of damage, always disconnect both
Heavy Power cables of the MSD. (You should also disconnect the tach ground wire too).
Distributor Cap and Rotor: It is recommended to install a new distributor cap and rotor when
installing the MSD Ignition Control. The cap should be clean inside and out especially the terminals
and rotor tip. On vehicles with smaller caps, it is possible for the air inside the cap to become
electrically charged causing crossre which can result in misre. This can be prevented by drilling
a couple vent holes in the cap. The holes should be placed between the terminals, at rotor height
and face away from the intake. If your environment demands it, place a small piece of non-metallic
screen over the hole to act as a lter.
Initial Spark: It is normal, yet not very common, for the MSD to produce a spark when the ignition
key is turned On. This is due to the capacitor being charged and if the pickup is in the right position,
it could trigger the ignition momentarily. This could also occur when installing the positive battery
cable.
MOUNTING
The MSD can be mounted in most positions. It can be mounted in the engine compartment as long
as it is away from direct engine heat sources. It is not recommended to mount the unit in an enclosed
area such as the glovebox.
When you nd a suitable location to mount the unit, make sure the wires of the ignition reach their
connections. Hold the Ignition in place and mark the location of the mounting holes. Use a 1/4” drill
bit to drill the holes. Install the vibration mounts to the ignition and mount the unit.
These examples are just starting points to
get you going in the right direction. Every
application is different and should be
tested and tuned.
Compression Spark Plug Gap
Up to 10.5:1: 0.050" - 0.060"
10.5:1 - 13.0:1: 0.040" - 0.050"
Above 13.0:1: 0.035" - 0.040"

4 INSTALLATION INSTRUCTIONS
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WIRING
GENERAL WIRING INFORMATION
Wire Length: All of the wires of the MSD Ignition may be shortened as long as quality connectors
are used or soldered in place. To lengthen the wires, use one size bigger gauge wire (10 gauge for
the power leads and 16 gauge for the other wires) with the proper connections. All connections must
be soldered and sealed.
Grounds: A poor ground connection can cause many frustrating problems.
When a wire is specied to go to ground, it should be connected to the
battery negative terminal, engine block or chassis. There should always
be a ground strap between the engine and the chassis. Always securely
connect the ground wire to a clean, paint free metal surface.
The 7AL-2 has a ground stud just to the left of the terminal strip. Use this
to ground other MSD accessories (Figure 3).
Ballast Resistor: If your vehicle has a ballast resistor in line with the coil
wiring, it is not necessary to bypass it. This is because this wire serves
only as an On/Off switch. The MSD receives its main power directly from
the battery.
Noise Capacitor: MSD offers a Noise Capacitor or Filter to help eliminate EMI noise. This capacitor,
GROUND
Terminal Wire Function
ORANGE Connects to the positive (+) terminal of the coil.This is the only wire that
makes electrical contact with the coil positive terminal.
COIL +
BLACK Connects to the negative (-) terminal of the coil. This is the only wire that
makes electrical contact with the coil negative terminal.
COIL -
HEAVY
BLACK
This wire connects to a good ground, either at the battery negative (-) terminal
or to the engine.
BAT -
HEAVY
RED
BAT +
TACHTACH
2-STEP
IGNITIONConnects to a switched 12 volt source. Such as the ignition key or switch.
RED
WHITE
This wire is used to connect to the points, electronic ignition amplifier output
or to the Yellow wire of an MSD Timing Accessory. When this wire is used,
the Magnetic Pickup connector is not used.
POINTS
VIOLETMAG +
GREENMAG -
DARK
BLUE
This wire connects directly to the battery positive (+) terminal or to a positive
battery junction or the positive side of the starter solenoid. Note: Never
connect to the alternator.
This terminal delivers a 12 volt square wave signal as an output for a
tachometer or devices that require an rpm signal.
When this terminal is connected to 12 volts, RPM module 1 is active. When
there is no 12 volts, RPM module 2 is active.
These wires are routed together in one harness from the Magnetic Pickup
connector. The connector plugs directly into an MSD Distributor or Crank
Trigger. It will also connect to factory magnetic pickups or other aftermarket
pickups (Figure 4). The Violet wire is pos. (+) and the Green is neg. (-).
When these wires are used, the Points Terminal is not.
Figure 3 Ground Stud.

INSTALLATION INSTRUCTIONS 5
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PN 8830, will also protect the MSD and accessories from
voltage and current spikes.
ROUTING WIRES
The MSD wires should be routed away from direct heat
sources such as exhaust manifolds and headers and any
sharp edges. The trigger wires should be routed separate
from the other wires and spark plug wires. It is best if they
are routed along a ground plane such as the block or rewall
which creates an electrical shield. The magnetic pickup
wires should always be routed separately and should be
twisted together to help reduce extraneous interference (the
harness supplied is already twisted).
The chart shows the polarity of other common magnetic pickups. If using a different magnetic
pickup, use the MSD 2-Pin connector, available as PN 8824, for a direct plug-in installation.
WARNING: The MSD 7 Series Ignitions are capacitive discharge ignitions. High voltage is present
at the coil primary terminals. Do not touch the coil or connect test equipment to the
terminals.
PRESTART CHECK LIST
• The only wires connected to the coil terminals are the MSD Orange to coil positive and Black to
coil negative.
• The small Red wire of the MSD is connected to a switched 12 volt source.
• The MSD power leads are connected directly to the battery positive and negative terminals.
• The battery is connected and fully charged if not using an alternator.
• The engine is equipped with at least one ground strap to the chassis.
TROUBLESHOOTING
Every MSD Ignition undergoes numerous quality control checks including a four hour burn-in test. If
you experience a problem with your MSD, our research has shown that the majority of problems are
due to improper installation or poor connections.
The Troubleshooting section has several checks and tests you can perform to ensure proper
installation and operation of the MSD. If you have any questions concerning your MSD, call our
Customer Support Department at [phone], 7 - 6 mountain time.
TACH/FUEL ADAPTERS
Common Mag Pickup Wires
Distributor Colors
Mag+ Mag-
MSD Org/Blk Vio/Blk
MSD Crank Trigger Org/Blk Vio/Blk
Ford Orange Purple
Accel 46/48000 Series Org/Blk Vio/Blk
Accel 51/61000 Series Red Black
Chrysler Org/Wht Black
Mallory Org/Blk Vio/Blk
Figure 4 Common Mag Pickup Wires.

6 INSTALLATION INSTRUCTIONS
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If your tachometer does not operate correctly or if you experience a no-run situation with your
foreign vehicle you probably need an MSD Tach Adapter. The chart below lists common tachometers
and if an Adapter is necessary.
INOPERATIVE TACHOMETERS
I f
your tachometer fails to operate with the MSD installed you may need an MSD Tach Adapter. Before
getting an Adapter, try connecting your tachometer trigger wire to the tach output terminal on the
side of the MSD. This output produces a 12 volt, square wave (see page 2). If the tach still does not
operate, you will need a Tach Adapter. There are two Tach Adapters:
PN 8920: If you are using the Magnetic Pickup connector (Green and Violet wires) to trigger the
MSD, you will need the PN 8920.
PN 8910: If your tachometer was triggered from the coil negative terminal (voltage trigger) and you
are using the White wire to trigger the MSD you will need the PN 8910.
ENGINE RUN-ON
If your engine continues to run even when the ignition is turned Off you are experiencing engine Run-
On. This usually only occurs on older vehicles with an external voltage regulator. Because the MSD
receives power directly from the battery, it does not require much current to keep the unit energized.
If you are experiencing run-on, it is due to a small amount of voltage going through the charging lamp
indicator and feeding the small Red wire even if the key is turned off.
Early Ford and GM: To solve the Run-On problem, a Diode is supplied with the MSD in the parts
bag. By installing this Diode in-line of the wire that goes to the Charging indicator, the voltage is kept
from entering the MSD. Figure 5 shows the proper installation for early Ford and GM vehicles.
Note: Diodes are used to allow voltage to ow only one way. Make sure the Diode is installed
facing the proper direction (as shown in Figure 5).
Ford: Install the Diode inline to the wire going to the “1” terminal.
Tachometer Compatibility List
AFTERMARKET TACHOMETER WHITE WIRE TRIGGER MAGNETIC TRIGGER CONNECTOR
AUTOGAGE 8910 8920
AUTOMETER NONE NONE
FORD MOTORSPORTS NONE NONE
MALLORY NONE NONE
MOROSO NONE NONE
STEWART 8910 8920
S.W. & BI TORX NONE NONE
SUN 8910 8920
VDO 8910 8920
AMC (JEEP) 8910 8920
CHRYSLER 8910 8920
FORD (Before 1976) 8910 8920
FORD (After 1976) 8910 8920
GENERAL MOTORS Bypass In-Line Filter Bypass In-line filter
IMPORTS 8910 8920
Note: On the list above, the trigger wire on tachometers that are marked NONE may be connected to the
Tach Output Terminal on the MSD 7 Series Ignition Unit using the supplied Female Faston Receptacle.

INSTALLATION INSTRUCTIONS 7
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GM: Install the Diode in-line to the wire going
to terminal “4”.
GM 1973 - 1983 with Delcotron Alternators
GM Delcotron Alternators use an internal
voltage regulator. Install the Diode in-line
on the smallest wire exiting the alternator
(Figure 6). It is usually a Brown wire.
MISSES AND INTERMITTENT PROBLEMS
Experience at the races has shown that if your engine is experiencing a miss or hesitation at higher
rpm, it is usually not directly ignition related. Most probable causes include a coil or plug wire failure,
arcing from the cap or boot plug to ground or spark ionization inside the cap. Several items to
inspect are:
• Always inspect the plug wires at the cap and at the plug for a tight connection and visually
inspect for cuts, abrasions or burns.
• Inspect the Primary Coil Wire connections. Because the MSD is a Capacitive Discharge
ignition and it receives a direct 12 volt source from the battery, there will not be any
voltage at the Coil Positive (+) terminal even with the key turned On. During cranking or
while the engine is running, very high voltage will be present and no test equipment should
be connected.
• Make sure that the battery is fully charged and the connections are clean and tight. If you
are not running an alternator this is an imperative check. If the battery voltage falls below
10 volts during a race, the MSD output voltage will drop.
WARNING: Do not touch the coil terminals during cranking or while the engine is running.
• Is the engine running lean or excessively rich? Inspect the spark plugs and fuel system.
• Inspect all wiring connections for corrosion or damage. Remember to always use proper
connections followed by soldering and seal the connections completely.
LED: The LED on the ignition will assist in troubleshooting. If the LED does not ash, there is no
current through the primary coil wires. This could be due to poor connections at the coil, the
coil itself or the ignition. Once you conrm that the trigger signal is working, try a different
coil. See page 8 to test for spark.
If everything checks positive, use the following procedure to test for spark. MSD also offers an
Ignition Tester, PN 8998. This tool allows you to check your complete ignition system while it is in the
car as well as the operation of rpm limits, activated switches and shift lights.
Figure 5 Installing the Diode to a GM or Ford Vehicle.
Figure 6 Installing the Diode to a 1973-1983 GM Vehicle.

8 INSTALLATION INSTRUCTIONS
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CHECKING FOR SPARK
If triggering the ignition with the White wire:
1. Make sure the ignition switch is in the “Off” position.
2. Remove the coil wire from the distributor cap and
set the terminal approximately 1/2” from ground.
3. Disconnect the MSD White wire from the distributor’s
points or ignition amplier.
4. Turn the ignition to the "On" position. Do not crank
the engine.
5. Rapidly tap the White wire to ground several times.
When the wire is pulled from ground, a spark should
jump from the coil wire to ground. If spark is present,
the ignition is working properly. If there is no spark
skip to step 6 below:
If triggering with the Magnetic Pickup:
1. Make sure the ignition switch is in the “Off” position.
2. Remove the coil wire from the distributor cap and
set the terminal approximately 1/2” from ground.
3. Disconnect the MSD magnetic pickup wires from
the distributor.
4. Turn the ignition to the "On" position. Do not crank
the engine.
5. With a small jumper wire, short the MSD’s Green
and Violet magnetic pickup wires together. Each
time you break this ground (rapidly), a spark should
jump from the coil wire to ground. If spark is present,
the ignition is working properly. If there is no spark
skip to step 6 below:
6. If there is no spark:
A. Inspect all of the wiring.
B. Substitute another coil and repeat the test. If there is now spark, the coil is at fault.
C. If there is still no spark, check to make sure there is 12 volts on the small Red wire from the MSD
when the key is in the "On" position. If 12 volts is not present, nd another switched 12 volt
source and repeat the test.
D. If, after following the test procedures and inspecting all of the wiring, there is still no spark, the
MSD Ignition is in need of repair. See the Warranty and Service section for information.
If there is no spark, but the LED ashes, check for a coil problem.
The following wiring diagrams illustrate numerous installations on different vehicles and applications.
If you experience difculties when installing your MSD, contact our Customer Support Department
at [phone] (7 - 6 Mountain time) or e-mail us at: [email protected]
GREEN
JUMPER
WIRE
VIOLET
MAGNETIC PICKUP TRIGGER
WHITE WIRE TRIGGER
Figure 8 Checking for Spark with Magnetic Pickup.
Figure 7 Checking for Spark with a White Wire.

INSTALLATION INSTRUCTIONS 9
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MSD SYSTEMS Installing to Points/Amplifier Style Ignition.
On dual point setups, it
is recommended to
remove the trailing set
of points.
NOTE:
MSD SYSTEMS Installing to an MSD Distributor/Crank Trigger.
TO 12 VOLTS

10 INSTALLATION INSTRUCTIONS
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MSD SYSTEMS Installing to an MSD Ready-to-Run Distributor
MSD SYSTEMS With an MSD Timing Control.

INSTALLATION INSTRUCTIONS 11
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GM IGNITIONS Wiring with an MSD to GM Wiring Harness.
Harness PN 8876 - Dual Connector Coil.
Harness PN 8877 - 1996-on GM Vehicles.
FORD IGNITIONS Wiring a Ford TFI with Harness, PN 8874.
NOTE: Installation of a Timing
Control with the
Harness, see page 12.

12 INSTALLATION INSTRUCTIONS
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GM IGNITIONS Wiring with an MSD to GM Wiring Harness and a Timing Control.
Harness PN 8876 - Dual Connector Coil.
Harness PN 8877 - 1996-on GM Vehicles.
GM IGNITIONS GM Large Cap HEI Distributors.
There are three different large cap HEI distributors. To identify which
of the following diagrams fit your specific application, remove the
distributor cap and rotor and locate the ignition module at the base of
the distributor. Count the number of terminals on both ends of the
module and follow the corresponding diagram. GM used 4, 5 and 7-pin
modules in these distributors.
NOTE: Some 5-pin models may experience a hesitation or stall on
deceleration. If this occurs, contact MSD Tech Line for the
required bolt-in diode to correct the problem. MSD Tech Line
[phone].
NOTE: The stock rotor button must be replaced with an MSD Low
Restraint Bushing PN 8412.

INSTALLATION INSTRUCTIONS 13
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GM IGNITIONS Wiring an HEI 4-pin Module (Magnetic Pickup Trigger).
NOTE:
NOTE:
The stock rotor button must be
replaced with an MSD Low Resis-
tance Bushing, PN 8412.
The GM Ignition Module is removed
and replaced with the MSD PN
8861 Wire Harness.
GM IGNITIONS Wiring an HEI 5 or 7-pin Module (Amplifier Trigger).
NOTE: NOTE: The stock rotor button must be replaced with
an MSD Low Resistance Bushing, PN 8412.
Some 5-pin models may experience
a hesitation or stall on decelera-
tion. If this occurs, contact MSD
Tech Line for the required bolt-in
diode to correct the problem. MSD
Tech Line [phone].

14 INSTALLATION INSTRUCTIONS
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FORD IGNITIONS Wiring a Ford DuraSpark using Magnetic Pickup Trigger.
HONDA IGNITIONS Wiring a Honda with Internal Coil.
NOTE: When used with 4 cyl. Honda,
cut 2 loops on Cyl. Select.

INSTALLATION INSTRUCTIONS 15
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CHRYSLER IGNITIONS Wiring a Chrysler Electronic Ignition using Magnetic Pickup Trigger.
AFTERMARKET COMPONENTS Wiring a Mallory Unilite or 9000 Series using Points Trigger.

AFTERMARKET COMPONENTS Wiring an Accel BEI Distributor using Magnetic Pickup.
Limited Warranty
M SD warrants this product to be free from defects in material and workmanship under its intended normal use*,
when properly installed and purchased from an authorized MSD dealer, for a period of one year from the date of
the original purchase. This warranty is void for any products purchased through auction websites. If found to be
defective as mentioned above, it will be repaired or replaced at the option of MSD. Any item that is covered under
this warranty will be returned free of charge using Ground shipping methods.
This shall constitute the sole remedy of the purchaser and the sole liability of MSD. To the extent permitted by
law, the foregoing is exclusive and in lieu of all other warranties or representation whether expressed or implied,
including any implied warranty of merchantability or tness. In no event shall MSD or its suppliers be liable for special
or consequential damages.
*Intended normal use means that this item is being used as was originally intended and for the original application
as sold by MSD. Any modications to this item or if it is used on an application other than what MSD markets the
product, the warranty will be void. It is the sole responsibility of the customer to determine that this item will work
for the application they are intending. MSD will accept no liability for custom applications.
Service
In case of malfunction, this MSD component will be repaired free of charge according to the terms of the warranty.
When returning MSD components for warranty service, Proof of Purchase must be supplied for verication. After
the warranty period has expired, repair service is based on a minimum and maximum fee.
All returns must have a Return Material Authorization (RMA) number issued to them before
being returned. To obtain an RMA number please contact MSD Customer Service at 1 (888) MSD-7859 or visit
our website at www.msdperformance.com/rma to automatically obtain a number and shipping information.
When returning the unit for repair, leave all wires at the length in which you have them installed. Be sure to include
a detailed account of any problems experienced, and what components and accessories are installed on the vehicle.
The repaired unit will be returned as soon as possible using Ground shipping methods (ground shipping is covered
by warranty). For more information, call MSD at [phone]. MSD technicians are available from 7:00 a.m. to
5:00 p.m. Monday - Friday (mountain time).
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