Battery Diagnosis; Battery Tray Description And Operation; Battery Thermoguard View - Jeep Cherokee 2000 Service Manual

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DESCRIPTION AND OPERATION (Continued)
BATTERY THERMOGUARD
DESCRIPTION
Fig. 4 Battery Thermoguard
1 – THERMOGUARD
2 – BATTERY
A flexible plastic bubble-wrap style thermoguard
(Fig. 4) slides over the battery case to enclose the
sides of the battery. The thermoguard consists of a
heavy black plastic outer skin and two lighter plies of
plastic that have been formed into a sheet with hun-
dreds of small air pockets entrapped between them.
The resulting material is very similar to the bubble-
wrap used to protect items in many parcel packaging
and shipping applications.
OPERATION
The thermoguard protects the battery from engine
compartment temperature extremes. The air trapped
between the plastic plies of the thermoguard create a
dead air space, which helps to insulate the sides of
the battery case from the surrounding engine com-
partment air temperature.
BATTERY TRAY
DESCRIPTION
The battery is mounted in a molded plastic tray
(Fig. 5) located in the right front corner of the engine
compartment. Two T-bolts that are part of the bat-
tery hold down hardware are assembled to the bat-
tery tray before the tray is installed in the vehicle.
The battery tray is secured by three hex nuts with
coned washers to three weld studs located on the
front extension of the right front wheelhouse inner
panel, forward of the right front wheel.
A hole in the bottom of the battery tray is fitted
with a battery temperature sensor. Refer to Battery
Temperature Sensor in the index of this service
Fig. 5 Battery Tray
1 – TRAY
2 – NUT AND WASHER (3)
3 – T-BOLT (2)
4 – RETAINER (2)
5 – WELD STUD (3)
manual for the location of more information on the
battery temperature sensor. Refer to Battery Hold
Downs in the index of this service manual for the
location of more information on the battery hold
down hardware.
OPERATION
The battery tray provides a mounting location and
support for the vehicle battery. The battery tray also
provides anchor points for the battery hold down
hardware. The battery tray and the battery hold
down hardware combine to secure and stabilize the
battery in the engine compartment, which prevents
battery movement during vehicle operation. Unre-
strained battery movement during vehicle operation
can result in damage to the vehicle, the battery or
both.
DIAGNOSIS AND TESTING
BATTERY
DIAGNOSIS
The battery, starting system and charging system
in the vehicle operate with one another, and must be
BATTERY 8A - 5