Jeep Grand Cherokee WK. Manual - part 363

BATTERY SYSTEM DIAGNOSIS

CONDITION

POSSIBLE CAUSES

CORRECTION

THE BATTERY STATE OF
CHARGE CANNOT BE
MAINTAINED.

1. The battery has an
incorrect size or rating for
this vehicle.

1. (Refer to 8 - ELECTRICAL/BATTERY SYSTEM
- SPECIFICATIONS) for the proper size and
rating. Replace an incorrect battery, as required.

2. The battery terminal
connections are loose or
corroded.

2. (Refer to 8 - ELECTRICAL/BATTERY
SYSTEM/CABLES - DIAGNOSIS AND
TESTING). Clean and tighten the battery terminal
connections, as required.

3. The electrical system
ignition-off draw is excessive.

3. (Refer to 8 - ELECTRICAL/BATTERY
SYSTEM/BATTERY - STANDARD PROCEDURE
- IGNITION-OFF DRAW TEST) for the proper test
procedures. Repair the inoperative electrical
system, as required.

4. The battery is inoperative.

4. Test the battery using the Micro 420 battery
tester, (Refer to 8 - ELECTRICAL/BATTERY
SYSTEM/BATTERY - STANDARD PROCEDURE
- USING MICRO 420 BATTERY TESTER).
Replace the inoperative battery, as required.

5. The starting system is
inoperative.

5. Determine if the starting system is performing
to specifications, (Refer to 8 - ELECTRICAL/
STARTING - DIAGNOSIS AND TESTING). Repair
the inoperative starting system, as required.

6. The charging system is
inoperative.

6. Determine if the charging system is performing
to specifications, (Refer to 8 - ELECTRICAL/
CHARGING - DIAGNOSIS AND TESTING).
Repair the inoperative charging system, as
required.

7. Electrical loads exceed the
output of the charging
system.

7. Inspect the vehicle for aftermarket electrical
equipment which might cause excessive electrical
loads.

8. Slow driving or prolonged
idling with high-amperage
draw systems in use.

8. Advise the vehicle operator, as required.

THE BATTERY WILL NOT
ACCEPT A CHARGE.

1. The battery is inoperative.

1. Test the battery using the Micro 420 battery
tester, (Refer to 8 - ELECTRICAL/BATTERY
SYSTEM/BATTERY - STANDARD PROCEDURE
- USING MICRO 420 BATTERY TESTER).
Replace the inoperative battery, as required.

CLEANING

The following information details the recommended cleaning procedures for the battery and related components. In
addition to the maintenance schedules found in this service manual, (Refer to LUBRICATION & MAINTENANCE/
MAINTENANCE SCHEDULES - DESCRIPTION) it is recommended that these procedures be performed any time
the battery or related components must be removed for vehicle service.

8F - 4

BATTERY SYSTEM - SERVICE INFORMATION

1. Clean the battery cable terminal clamps (2) of all

corrosion. Remove any corrosion using a wire
brush or a post and terminal cleaning tool (1), and
a sodium bicarbonate (baking soda) and warm
water cleaning solution.

2. Clean the battery tray and battery hold down hard-

ware of all corrosion. Remove any corrosion using
a wire brush and a sodium bicarbonate (baking
soda) and warm water cleaning solution (2). Paint
any exposed bare metal.

3. If the removed battery is to be reinstalled, clean the

outside of the battery case (3) and the top cover
with a sodium bicarbonate (baking soda) and warm
water cleaning solution (2) using a stiff bristle parts
cleaning brush (1) to remove any acid film. Rinse
the battery with clean water. Ensure that the clean-
ing solution does not enter the battery cells through
the vent holes. If the battery is being replaced, con-
firm that the replacement battery is the correct size
and has the correct ratings for the vehicle.

4. Clean the battery thermal guard with a sodium

bicarbonate (baking soda) and warm water clean-
ing solution (2) using a stiff bristle parts cleaning
brush (1) to remove any acid film.

BATTERY SYSTEM - SERVICE INFORMATION

8F - 5

5. Clean any corrosion from the battery terminal posts

with a wire brush or a post and terminal cleaner (1)
and a sodium bicarbonate (baking soda) and warm
water cleaning solution.

INSPECTION

The following information details the recommended inspection procedures for the battery and related components. In
addition to the maintenance schedules, (Refer to LUBRICATION & MAINTENANCE/MAINTENANCE SCHEDULES -
DESCRIPTION), it is recommended that these procedures be performed any time the battery or related components
are removed for vehicle service.

1. Inspect the battery cable terminal clamps for damage. Replace any battery cable that has a damaged or

deformed terminal clamp.

2. Inspect the battery tray and battery hold down hardware for damage. Replace any damaged parts.

3. Slide the thermal guard off of the battery case, if equipped. Inspect the battery case for cracks or other damage

that could result in electrolyte leaks. Also, check the battery terminal posts for looseness. Batteries with damaged
cases or loose terminal posts must be replaced.

4. Inspect the battery thermal guard for tears, cracks, deformation or other damage. Replace any battery thermal

guard that has been damaged.

5. Inspect the battery built-in test indicator sight glass (if equipped) for an indication of the battery condition. If the

battery is discharged, charge as required, (Refer to 8 - ELECTRICAL/BATTERY SYSTEM/BATTERY - STAN-
DARD PROCEDURE - BATTERY CHARGING).

SPECIFICATIONS

The battery Group Size number, the Cold Cranking Amperage (CCA) rating, and the Reserve Capacity (RC) rating
or Ampere-Hours (AH) rating can be found on the original equipment battery label. Be certain that a replacement
battery has the correct Group Size number, as well as CCA, and RC or AH ratings that equal or exceed the original
equipment specification for the vehicle being serviced. Battery sizes and ratings are discussed in more detail below.

•

Group Size - The outside dimensions and terminal placement of the battery conform to standards established
by the Battery Council International (BCI). Each battery is assigned a BCI Group Size number to help identify
a correctly-sized replacement.

•

Cold Cranking Amperage - The Cold Cranking Amperage (CCA) rating specifies how much current (in
amperes) the battery can deliver for thirty seconds at -18° C (0° F). Terminal voltage must not fall below 7.2
volts during or after the thirty second discharge period. The CCA required is generally higher as engine dis-
placement increases, depending also upon the starter current draw requirements.

•

Reserve Capacity - The Reserve Capacity (RC) rating specifies the time (in minutes) it takes for battery ter-
minal voltage to fall below 10.5 volts, at a discharge rate of 25 amperes. RC is determined with the battery
fully-charged at 26.7° C (80° F). This rating estimates how long the battery might last after a charging system
failure, under minimum electrical load.

8F - 6

BATTERY SYSTEM - SERVICE INFORMATION

•

Ampere-Hours - The Ampere-Hours (AH) rating specifies the current (in amperes) that a battery can deliver
steadily for twenty hours, with the voltage in the battery not falling below 10.5 volts. This rating is also some-
times identified as the twenty-hour discharge rating.

BATTERY CLASSIFICATIONS & RATINGS

Part Number

BCI Group Size

Classification

Cold Cranking

Amperage

Reserve

Capacity

Ampere -

Hours

Load Test

Amperage

04608719AC

730

140 Minutes

250

BATTERY SYSTEM - SERVICE INFORMATION

8F - 7

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