Coolant Temperature Gauge Diagnosis; Instrument Cluster Replacement; Gauge And Meter Replacement; Ammeter—Cherokee-Wagoneer-Truck Vehicles - Jeep J-10 Series 1982 Technical & Service Manual

Coolant Temperature Gauge Diagnosis
Before performing a coolant temperature gauge diag
nosis, ensure the cooling system is functioning nor
mally. Overheating can be caused by low coolant level,
restrictions, loose or broken drive belt(s), defective wa
ter pump or incorrect ignition timing. Undercooling can
be caused by a stuck thermostat (in open position). Con
sider these possibilities before suspecting an actual mal
function in the coolant temperature gauge system. A
coolant temperature gauge malfunction can result in
any one of the following conditions:
• pointer does not move,
• pointer moves but indicates a coolant temperature
that does not correspond with the actual coolant
temperature,
• pointer moves to the top of the scale and remains
there,
• pointer pulsates.
Refer to DARS chart 6 for a systematic method of
locating the causes of these abnormal conditions. Charts
2 and 3 provide additional procedures that should be
used only as directed in chart 6.
INSTRUMENT CLUSTER REPLACEMENT
CJ Vehicles
Removal
(1) Disconnect battery negative cable.
(2) Disconnect speedometer cable from speed
ometer.
(3) Remove four attaching nuts and pull cluster
from mounting studs.
(4) Note positions of all lamps. Note wire colors for
reference during installation.
(5) Remove gauge/meter wires and lamps.
Installation
(1) Install gauge and meter wires and lamps
fAH cluster.
(2) Position cluster on mounting studs and install
attaching nuts.
(3) Connect speedometer cable.
(4) Connect battery negative cable.
(5) Reset clock, if equipped.
Cherokee-Wagoneer-Truck Vehicles
Removal
(1) Disconnect battery negative cable.
(2) Remove cluster retaining screws.
(3) Disconnect speedometer cable at cluster.
in
ENGINE INSTRUMENTATION 1L-5
(4) Disconnect cluster terminal pin plug by pulling
straight off.
(5) Disconnect four-terminal connector.
(6) Identify and tag ammeter wires for installation
reference. Disconnect ammeter wires.
(7) Disconnect blower motor wire connector.
(8) Disconnect vacuum hoses from heater control.
NOTE: Tag each hose according to its numbered loca
tion to ensure proper connection when installing cluster.
(9) Remove heater control panel lamps.
(10) Disconnect heater temperature control wire
from lever.
(11) Remove cluster assembly.
Installation
(1) Connect wiring harness connectors and install
lamps in heater control.
(2) Connect heater temperature control wire to
lever. ~ —
(3) Connect vacuum hoses to heater control.
(4) Connect cluster wire connectors.
(5) Install ammeter wires at original locations. If
wires are reversed, ammeter will indicate in reverse
(i.e., discharge instead of charge). Ensure wire terminal
nuts are tight, otherwise electrical system failure will
result.
(6) Connect speedometer cable.
(7) Position cluster on instrument panel and install
screws.
(8) Connect battery negative cable.
(9) Reset clock, if equipped.
GAUGE AND METER REPLACEMENT
Ammeter—Cherokee-Wagoneer-Truck Vehicles
(1) Remove cluster.
(2) Remove printed circuit board and gauge assem
bly from bezel.
(3) Remove mask from oil pressure gauge and
ammeter.
CAUTION: Use care to prevent scratching paint on
mask.
(4) Remove attaching nuts and remove ammeter.
(5) Install replacementammeter, connect wires and
tighten nuts. If nuts are not properly tightened elec
trical failure will result.
(6) Install mask and screws.
(7) Install printed circuitboard and gauge assembly
on bezel.
(8) Install cluster.
(9) Start engine and observe ammeter for proper
operation.