Centech 59000 User manual
Visit our website at: http://www.harborfreight.com
Owner’s Manual & Safety Instructions
Save This Manual Keep this manual for the safety warnings and precautions, assembly,
operating, inspection, maintenance and cleaning procedures. Write the product’s serial number in the back
of the manual near the assembly diagram (or month and year of purchase if product has no number). Keep
this manual and the receipt in a safe and dry place for future reference. 22h
When unpacking, make sure that the product is intact
and undamaged. If any parts are missing or broken,
please call 1-888-866-5797 as soon as possible.
Copyright©2021 by Harbor Freight Tools®. All rights reserved.
No portion of this manual or any artwork contained herein may be reproduced in
any shape or form without the express written consent of Harbor Freight Tools.
Diagrams within this manual may not be drawn proportionally. Due to continuing
improvements, actual product may differ slightly from the product
described herein. Tools required for assembly and service may not be included.
Read this material before using this
product. Failure to do so can result in
serious injury. SAVE THIS MANUAL.
Page 2 For technical questions, please call 1-888-866-5797. Item 59000
IMPORTANT SAFETY INSTRUCTIONS
1. SAVE THESE INSTRUCTIONS
– This manual contains important
safety and operating instructions
for this battery Maintainer.
2. Do not expose Maintainer to rain or snow.
3. Use of an attachment not recommended
or sold by the battery Maintainer
manufacturer may result in a risk of fire,
electric shock, or injury to persons.
4. To reduce risk of damage to electric
plug and cord, pull by plug rather than
cord when disconnecting Maintainer.
5. An extension cord should not be used
unless absolutely necessary. Use of
improper extension cord could result
in a risk of fire and electric shock. If an
extension cord must be used, make sure:
a. That pins on plug of extension cord
are the same number, size, and shape
as those of plug on Maintainer;
b. That extension cord is properly wired
and in good electrical condition; and
c. That wire size is large enough for
AC ampere rating of Maintainer
as specified in Table A.
Table A: Recommended minimum AWG size
for extension cords for battery Maintainer
AC input rating, amperes* AWG size of cord
Length of cord, feet
Equal to or
greater than
But less
than 25 50 100 150
0 2 18 18 18 16
2 3 18 18 16 14
3 4 18 18 16 14
4 5 18 18 14 12
5 6 18 16 14 12
6 8 18 16 12 10
8 10 18 14 12 10
10 12 16 14 10 8
12 14 16 12 10 8
14 16 16 12 10 8
16 18 14 12 8 8
18 20 14 12 8 6
* If the input rating of a Maintainer is given in watts rather than in
amperes, the corresponding ampere rating is to be determined by
dividing the wattage rating by the voltage rating – for example:
1250 watts/125 volts = 10 amperes
6. Do not operate Maintainer with
damaged cord or plug – replace
the cord or plug immediately.
7. Do not operate Maintainer if it has
received a sharp blow, been dropped,
or otherwise damaged in any way;
take it to a qualified serviceman.
8. Do not disassemble Maintainer; take it
to a qualified technician when service or
repair is required. Incorrect reassembly
may result in a risk of electric shock or fire.
9. To reduce risk of electric shock, unplug
Maintainer from outlet before attempting
any maintenance or cleaning.
10.WARNING – RISK OF
EXPLOSIVE GASES.
a. WORKING IN VICINITY OF A LEAD-
ACID BATTERY IS DANGEROUS.
BATTERIES GENERATE EXPLOSIVE
GASES DURING NORMAL
BATTERY OPERATION. FOR THIS
REASON, IT IS OF UTMOST
IMPORTANCE THAT YOU FOLLOW
THE INSTRUCTIONS EACH TIME
YOU USE THE MAINTAINER.
b. To reduce risk of battery explosion,
follow these instructions and those
published by battery manufacturer and
manufacturer of any equipment you
intend to use in vicinity of battery.
Review cautionary marking on
these products and on engine.
11. PERSONAL PRECAUTIONS
a. Consider having someone close
enough by to come to your aid when
you work near a lead-acid battery.
b. Have plenty of fresh water and
soap nearby in case battery acid
contacts skin, clothing, or eyes.
c. Wear complete eye protection and
clothing protection. Avoid touching
eyes while working near battery.
Page 3For technical questions, please call 1-888-866-5797.Item 59000
d. If battery acid contacts skin or
clothing, wash immediately with
soap and water. If acid enters eye,
immediately flood eye with running
cold water for at least 10 minutes and
get medical attention immediately.
e. NEVER smoke or allow a spark or
flame in vicinity of battery or engine.
f. Be extra cautious to reduce risk
of dropping a metal tool onto
battery. It might spark or short-
circuit battery or other electrical
part that may cause explosion.
g. Remove personal metal items such
as rings, bracelets, necklaces, and
watches when working with a lead-
acid battery. A lead-acid battery can
produce a short-circuit current high
enough to weld a ring or the like to
metal, causing a severe burn.
h. Use Maintainer for charging Gel,
LEAD-ACID or Absorbed Glass
Mat (AGM) batteries only. It is not
intended to supply power to a low
voltage electrical system other than
in a starter-motor application. Do not
use battery Maintainer for charging
dry-cell batteries that are commonly
used with home appliances. These
batteries may burst and cause injury
to persons and damage to property.
i. NEVER charge a frozen battery.
12.PREPARING TO CHARGE
a. If necessary to remove battery from
vehicle to charge, always remove
grounded terminal from battery first.
Make sure all accessories in the vehicle
are off, so as not to cause an arc.
b. Be sure area around battery
is well ventilated while battery
is being charged.
c. Clean battery terminals. Be
careful to keep corrosion from
coming in contact with eyes.
d. Add distilled water in each cell until
battery acid reaches level specified by
battery manufacturer. Do not overfill.
For a battery without removable
cell caps, such as valve regulated
lead acid batteries, carefully follow
manufacturer’s recharging instructions.
e. Study all battery manufacturer’s
specific precautions while charging
and recommended rates of charge.
f. Determine voltage of battery by
referring to vehicle owner’s manual
and make sure it matches output
rating of battery Maintainer.
g. Do not place Maintainer or electrical
connections on ground or floor.
13.MAINTAINER LOCATION
a. Locate Maintainer as far away from
battery as DC cables permit.
b. Never place Maintainer directly
above battery being charged;
gases from battery will corrode
and damage Maintainer.
c. Never allow battery acid to drip on
Maintainer when reading electrolyte
specific gravity or filling battery.
d. Do not operate Maintainer in a closed-in
area or restrict ventilation in any way.
e. Do not set a battery on
top of Maintainer.
14.DC CONNECTION PRECAUTIONS
a. Connect and disconnect DC output
clips only after removing AC cord
from electric outlet. Never allow
clips to touch each other.
b. Attach clips to battery and chassis
as indicated in 15(e), 15(f),
and 16(b) through 16(d).
Page 4 For technical questions, please call 1-888-866-5797. Item 59000
15.FOLLOW THESE STEPS WHEN
BATTERY IS INSTALLED IN VEHICLE.
A SPARK NEAR BATTERY MAY CAUSE
BATTERY EXPLOSION. TO REDUCE
RISK OF A SPARK NEAR BATTERY:
a. Position AC and DC cables to
reduce risk of damage by hood,
door, or moving engine part.
b. Stay clear of fan blades, belts,
pulleys, and other parts that
can cause injury to persons.
c. Check polarity of battery posts.
POSITIVE (POS, P, +) battery post
usually has larger diameter than
NEGATIVE (NEG, N,–) post.
d. Determine which post of battery is
grounded (connected) to the chassis.
If negative post is grounded to chassis
(as in most vehicles), see (e). If positive
post is grounded to the chassis, see (f).
e. For negative-grounded vehicle,
connect POSITIVE (RED) clip from
battery Maintainer to POSITIVE (POS,
P, +) ungrounded post of battery.
Connect NEGATIVE (BLACK) clip to
vehicle chassis or engine block away
from battery. Do not connect clip to
carburetor, fuel lines, or sheet-metal
body parts. Connect to a heavy gauge
metal part of the frame or engine block.
f. For positive-grounded vehicle, connect
NEGATIVE (BLACK) clip from battery
Maintainer to NEGATIVE (NEG, N, –)
ungrounded post of battery. Connect
POSITIVE (RED) clip to vehicle chassis
or engine block away from battery.
Do not connect clip to carburetor,
fuel lines, or sheet-metal body parts.
Connect to a heavy gauge metal
part of the frame or engine block.
g. When disconnecting maintainer,
disconnect AC cord, remove clip
from vehicle chassis, and then
remove clip from battery terminal.
h. See operating instructions for
length of charge information.
16.FOLLOW THESE STEPS
WHEN BATTERY IS OUTSIDE
VEHICLE. A SPARK NEAR THE
BATTERY MAY CAUSE BATTERY
EXPLOSION. TO REDUCE RISK
OF A SPARK NEAR BATTERY:
a. Check polarity of battery posts.
POSITIVE (POS, P, +) battery post
usually has a larger diameter than
NEGATIVE (NEG, N, –) post.
b. Attach at least a 24-inch-long 6-gauge
(AWG) insulated battery cable to
NEGATIVE (NEG, N, –) battery post.
c. Connect POSITIVE (RED)
Maintainer clip to POSITIVE
(POS, P, +) post of battery.
d. Position yourself and free end of cable
as far away from battery as possible
– then connect NEGATIVE (BLACK)
Maintainer clip to free end of cable.
e. Do not face battery when
making final connection.
f. When disconnecting Maintainer,
always do so in reverse sequence
of connecting procedure and
break first connection while as far
away from battery as practical.
g. A marine (boat) battery must be
removed and charged on shore. To
charge it on board requires equipment
specially designed for marine use.
17. Wear ANSI-approved
splash-resistant safety goggles
and heavy-duty rubber
work gloves whenever
connecting, disconnecting, or
working near battery. Battery acid
can cause permanent blindness.
18.Maintain labels and nameplates on the
Maintainer.
These carry important safety information.
If unreadable or missing, contact
Harbor Freight Tools for a replacement.
19.This product is not a toy.
Keep it out of reach of children.
Page 5For technical questions, please call 1-888-866-5797.Item 59000
20.Unplug the Battery Maintainer from its
electrical outlet before connecting its cables
to a battery, or performing any inspection,
maintenance, or cleaning procedures.
21.Use this Maintainer with gel, lead-
acid batteries or Absorbed Glass
Mat (AGM) batteries only. When
charging a maintenance-free battery,
always monitor the progress of the
charge by viewing the ammeter.
22.Do not attempt to charge
non-rechargeable, damaged,
or defective batteries.
23.Do not charge more than one
battery at one time.
24.Remove Maintainer AC Adapter from
electrical outlet, then disconnect the
battery clamps when finished.
25.Have your Maintainer serviced
by a qualified repair person using
only identical replacement parts.
This will ensure that the safety of
the Maintainer is maintained.
26.Do not use Maintainer while you are tired
or under the influence of drugs, alcohol
or medication. A moment of inattention
while operating Maintainer may
result in serious personal injury.
27.Before moving Maintainer, disconnect
power supply and battery, then
allow Maintainer to cool.
28.This product is not a toy. Do not allow
children to play with or near this item.
29.Use as intended only.
30.People with pacemakers should
consult their physician(s) before use.
Electromagnetic fields in close proximity to
heart pacemaker could cause pacemaker
interference or pacemaker failure.
In addition, people with pacemakers
should:
• Avoid operating alone.
• Properly maintain and inspect to avoid
electrical shock.
• Properly ground power cord. Ground
Fault Circuit Interrupter (GFCI) should
also be implemented – it prevents
sustained electrical shock.
31.The warnings, precautions, and
instructions discussed in this instruction
manual cannot cover all possible
conditions and situations that may occur.
It must be understood by the operator that
common sense and caution are factors
which cannot be built into this product,
but must be supplied by the operator.
32.Inspect before every use; do not use
if parts are loose or damaged.
33.Use with 12 volt batteries only.
SAVE THESE INSTRUCTIONS
.
Specifications
Input 120VAC, 60Hz, 190mA Max.
Rated Output 12VDC / 0.5A
Maximum Output 13.2 VDC
Battery Capacity 5 – 125 Ah
Cable Length 10ft.
Page 6 For technical questions, please call 1-888-866-5797. Item 59000
Operation Instructions
Read the ENTIRE IMPORTANT SAFETY INFORMATION section
at the beginning of this document including all text under subheadings therein
before set up or use of this product.
Note: This Float Maintainer is intended only to keep a fully charged battery from
losing its charge. It will not work to charge a battery that is discharged or damaged.
Note: Check battery voltage with a
multimeter before use. The Battery MUST
be fully charged to at least 12 Volts.
The Float Maintainer prevents self-discharge of the battery, while maintaining
the life of rechargeable 12 volt lead-acid, AGM, and gel batteries. It maintains
a battery rated from 5 – 125 Ah (amp-hours), by providing a small current
to the battery to bring the battery voltage to a fully charged level.
Connection
A SPARK NEAR BATTERY MAY CAUSE BATTERY EXPLOSION.
TO REDUCE RISK OF A SPARK NEAR BATTERY follow these instructions
exactly.
TO PREVENT SERIOUS INJURY:
Wear ANSI-approved splash-resistant safety goggles and heavy-duty rubber
work gloves whenever connecting, disconnecting, or working near battery.
Battery acid can cause permanent blindness.
1. Place Float Maintainer within 3 feet of
battery.
Unplug the AC Adapter.
2. To temporarily attach the Clip
Connector to the battery,
a. Connect POSITIVE (RED)
Clip Connector to POSITIVE
(POS, P, +) post of battery.
b. Connect NEGATIVE (BLACK)
Clip Connector to NEGATIVE
(NEG, N, –) post of battery.
WARNING! TO PREVENT SHORT
CIRCUIT AND FIRE: Do not leave
Clips attached indefinitely.
WARNING! TO PREVENT
SERIOUS INJURY: Do not connect
Connector to carburetor, fuel lines,
or sheet-metal body parts.
Note: The LED indicator shows solid
yellow when AC adapter is connected
to electrical outlet and clamps are not
connected to battery, or, if the clamps contact
each other and create a short circuit.
3. Plug AC Adapter into electrical outlet.
Page 7For technical questions, please call 1-888-866-5797.Item 59000
Record Serial Number Here:
Note: If product has no serial number, record
month and year of purchase instead.
Note: Refer to UPC 193175454416.
Replacement parts are not
available for this item.
LED Functions
1. Flashing Red:
a. Clamps are reversely connected.
b. Battery voltage type is
not supported. Only 12V
batteries are supported.
c. Bad battery.
2. Solid Yellow: Clamps are not
connected to battery.
3. Flashing Green: Battery is charging.
4. Solid Green: Battery is fully
charged, and the Maintainer is
monitoring the charged Battery.
After Use
1. Unplug the AC Adapter.
2. Remove the Black clip, then
the Red clip from battery.
3. Wipe the Maintainer with a clean,
dry cloth and store indoors
out of reach of children.
Maintenance Instructions
Procedures not specifically explained in this manual must be performed only by
a qualified technician.
TO PREVENT SERIOUS INJURY: Unplug the Maintainer, disconnect
any battery, and allow Maintainer to cool completely before performing
any inspection, maintenance, or cleaning procedures.
TO PREVENT SERIOUS INJURY FROM TOOL FAILURE:
Do not use damaged equipment. If abnormal noise or vibration occurs,
have the problem corrected before further use.
1. BEFORE EACH USE, inspect the general
condition of the Maintainer. Check for:
• loose hardware,
• cracked or broken parts,
• damaged electrical wiring
or cable insulation, and
• any other condition that may
affect its safe operation.
2. AFTER USE, wipe external surfaces
of the tool with clean cloth.
3. WARNING! TO PREVENT SERIOUS
INJURY: If the supply cord of this
Maintainer is damaged, it must
be replaced only by a qualified
service technician. DO NOT OPEN
MAINTAINER HOUSING, NO USER-
SERVICEABLE PARTS INSIDE.
Limited 90 Day Warranty
Harbor Freight Tools Co. makes every effort to assure that its products meet high quality
and durability standards, and warrants to the original purchaser that this product is free from
defects in materials and workmanship for the period of 90 days from the date of purchase.
This warranty does not apply to damage due directly or indirectly, to misuse, abuse, negligence
or accidents, repairs or alterations outside our facilities, criminal activity, improper installation,
normal wear and tear, or to lack of maintenance. We shall in no event be liable for death,
injuries to persons or property, or for incidental, contingent, special or consequential damages
arising from the use of our product. Some states do not allow the exclusion or limitation of
incidental or consequential damages, so the limitation of exclusion may not apply to you.
THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES, EXPRESS
OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS.
To take advantage of this warranty, the product or part must be returned to us
with transportation charges prepaid. Proof of purchase date and an explanation
of the complaint must accompany the merchandise. If our inspection verifies the
defect, we will either repair or replace the product at our election or we may elect
to refund the purchase price if we cannot readily and quickly provide you with a
replacement. We will return repaired products at our expense, but if we determine
there is no defect, or that the defect resulted from causes not within the scope
of our warranty, then you must bear the cost of returning the product.
This warranty gives you specific legal rights and you may also
have other rights which vary from state to state.
26677 Agoura Road • Calabasas, CA 91302 • 1-888-866-5797
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