1988 JEEP CHEROKEE wiring

NOTE: Activation of the vacuum advance may align trigger wheel
tooth and pick-up coil pole piece causing ohmmeter pointer
to deflect. This deflection should not be diagnosed as a
faulty pick-up coil.
1) Isolate 2 pick-up coil lead wires. Remove pick-up coil
connector from module. Connect ohmmeter to either terminal and ground.
See Fig. 6 . Connect pump and apply vacuum to test vacuum advance unit.
Replace vacuum advance unit if inoperative. Connect ohmmeter to pick-
up coil terminals. Operate vacuum pump and observe ohmmeter throughout
the vacuum range.
2) Attach ohmmeter to one pick-up coil terminal and
distributor housing. Set ohmmeter to middle scale. Operate vacuum
advance throughout vacuum range. Reading should be infinite at all
times. If not, replace pick-up coil. See Meter "A" in Fig. 6.
3) Connect ohmmeter leads to pick-up coil connector termials.
Operate vacuum pump to ensure proper operation throughout vacuum
range. Flex terminal wires by hand to check for possible intermittent
defects in wiring or connectors. Pick-up resistance should be 500-1500
ohms. If resistance is incorrect, replace the pick-up coil. See Meter
"B" in Fig. 6.
Fig. 6: Pick-Up Coil Test Connections
Courtesy of General Motors Corp.
CAPACITOR

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IN STR UM EN T P A N EL - S TA N DAR D

1988 J e ep C hero ke e
1988 Switches & Instrument Panels
JEEP
DESCRIPTION & OPERATION
Instrument panel is composed of speedometer housing,
tachometer and instrument cluster gauges.
FUEL GAUGE
System consists of a fuel gauge, an in-tank sending unit, and
appropriate wiring. Fuel gauge is grounded through variable resistor
of sending unit. A float attached to a slide rheostat follows fuel
level and varying resistance increases or decreases indicator reading.
TEMPERATURE GAUGE
System consists of gauge and sending unit and appropriate
wiring. The gauge is grounded through variable resistor of sending
unit. Changes in coolant temperature vary resistance in sending unit,
increasing or decreasing indication on gauge.
VOLTMETER
The voltmeter indicates regulated voltage to provide an
indication of charging system's ability to maintain battery charge.
OIL PRESSURE GAUGE
The oil pressure gauge system consists of gauge and a
variable resistance sending unit. Gauge needle, attached to bi-
metallic strip, responds to temperature changes.
REMOVAL & INSTALLATION
INSTRUMENT CLUSTER
Removal & Installation
1) Disconnect negative battery cable. On models with cruise
control, reach behind instrument cluster and disconnect speedometer
cable from speed switch. See Fig. 1.
2) On models without cruise control, raise vehicle on hoist.
Disconnect speedometer cable from transfer case (or transmission) and
at frame rail bracket. Move speedometer cable forward and upward to
provide slack. Lower vehicle.
3) On all models, remove instrument panel bezel screws and
bezel. Remove screws attaching cigarette lighter and switch housings
to instrument panel. Move housings aside.
4) Remove screws attaching cluster to instrument panel and
carefully pull cluster and speedometer toward rear of vehicle.
Disconnect wiring harness connectors.
5) Squeeze speedometer cable locking tabs and disconnect
cable from speedometer. See Fig. 1. Remove instrument cluster. To
install, reverse removal procedure.

1 - 25 Amp
Rear Washer/Wiper
2 - 15 Amp
Radio, Cigarette Lighter
3 - 25 Amp
Blower Motor
4 - 20 Amp
Turn Signal, Back-Up Lights, Rear Window Defogger Relay
5 - 10 Amp
Dome Light, Courtesy Lights, Glove Box Light, Cargo Light,
Radio Memory, Power Mirrors, Teltak Connector
6 - 15 Amp
Hazard Warning System, Stoplights
7 - 10 Amp
Parking Lights, Headlight Warning Chime/Buzzer, Instrument
Panel Light Dimmer
8 - 7.5 Amp
Gauges, Instrument Cluster, Seat Belt Warning,
Headlight Delay, Chime Module, Overhead Console
9 - 5 Amp
Instrument Panel Illumination
10 - 25 Amp
Rear Window Defogger
11 - 30 Amp (Circuit Breaker)
Power Door Locks, Power Seats, Trailer Towing Wiring Harness
12 - 10 Amp
ETR Radio, Power Antenna
13 - Not Used (1984-87)
7.5 Amp (1988)
Transmission Control Unit
14 - 25 Amp
Headlight Delay, Horns, Security Alarm
15 - 5.5 Amp (Circuit Breaker)
Front Wiper
16 - 30 Amp (Circuit Breaker)
Power Windows
17 - 10 Amp
Clock, Security Alarm (IGN)

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MIR RO RS - P O W ER

1988 J e ep C hero ke e
1988 Power Mirrors
JEEP
DESCRIPTION
Outside power rear view mirrors consist of door-mounted
mirrors with internal motor drive and backing plate. The Ford
electronic day/night mirror will change from normal to non-glare
position when glare reaches mirror. The non-glare functions only at
night.
TESTING
Mirror Motors & Switches
1) Ensure fuse is okay by operating interior lights. If
neither mirror operates, check for battery voltage at power mirror
switch assembly. Connect a voltmeter between terminal "G" (Red with
White stripe) and ground. If battery voltage is present, connect
voltmeter between terminals "G" and "F" (Black). If battery voltage is\
not present, check circuit at Red with White stripe wire and Black
wire.
2) If one mirror does not operate, connect a voltmeter across
power mirror switch assembly terminals. See Fig. 1. Voltage will be
present when control switch and mirror select switch are operated for
that motor.
Fig. 1: Jeep Switch Assembly Check Chart
Courtesy of American Motors/Jeep Corp.
3) If voltage is present but mirror does not operate, check
motor and wiring. If voltage is not present when 2 switches are on,

If test light glows, check tailgate window motor.
TAILGATE WINDOW MOTOR
Grand Wagoneer
1) Using a 12-volt test light, connect one end of test light
to ground and probe Tan wire at motor. Close safety switch and turn
tailgate window switch to "DOWN" position. If test light glows and
motor does not operate, replace motor. If test light does not glow,
check feed circuit to motor and repair as necessary.
2) Probe Brown wire at motor. Close safety switch and turn
tailgate window switch to "UP" position. If test light glows and motor
does not operate, replace motor. If test light does not glow, check
feed circuit to motor and repair as necessary.
SIDE WINDOW MASTER SWITCH CIRCUIT
1) Remove escutcheon and housing from master switch. Separate
terminal plate by releasing retainer hooks to expose terminal ends.
Turn ignition on.
2) Using a 12-volt test light, connect one lead to Black wire
and other lead to Red terminal. Repeat test at second Black wire. If
test light does not glow in either test, remove lead to Black terminal
and connect to chassis ground.
3) If test light glows, an open exists between master switch
and ground. If test light does not glow, it indicates a defective
circuit breaker or an opening in the Red wire from circuit breaker to
master switch.
SIDE WINDOW CONTROL SWITCH & MOTOR TEST
Grand Wagoneer
1) Connect test light between terminals of Orange and Yellow
wires. Operate control switch up and down. If test light glows in both
switch positions, wires, individual door and master switches are not
defective.
2) Disconnect White and Green motor leads at terminal plate,
and connect to Green and White leads. Operate master switch. If window
goes up and down, motor is okay, but switch is defective. If motor
does not operate, remove trim panel and check connections and leads to
motor. If motor operates, switch is defective.
SIDE WINDOW MOTOR
Connect test battery positive lead to one of the motor
terminals. Connect negative lead to other terminal. Motor should
rotate in one direction to go up or down. Reverse battery leads, motor
should rotate in opposite direction. If window does not move, replace
motor.
SWITCH VOLTAGE TEST
1) Turn ignition on. Remove switch from trim panel.
Disconnect terminal block on wiring harness from switch body. Connect
one lead of test light to Red wire terminal and other end to ground.
2) If test light glows, wiring between battery and switch is
functional. Check continuity in Black wire (ground). If test light
does not glow, check circuit breaker. If okay, check for a broken
wire.
SWITCH UP & SWITCH DOWN TEST

TAILGATE WINDOW REGULATOR & MOTOR
Removal (Grand Wagoneer)
1) Remove carpet (if equipped) and tailgate access cover.
Remove retainers attaching regulator arms to channel. Disengage
regulator arm pins from channel, and raise glass.
2) Carefully support glass in raised position. Disconnect
wiring harness from safety switch. If regulator attaching screws are
covered by sector gears, place a jumper wire between terminals of
safety switch connector.
NOTE: If regulator attaching screws are accessible, remove
regulator attaching screws and regulator.
3) Place key in tailgate switch and operate motor until
regulator attaching screws are accessible. Hold regulator in this
position, and wedge a screw between meshing teeth.
4) Remove regulator attaching screws and regulator. Using a
large screwdriver, release spring tension from tension bracket. Remove
motor attaching screws and motor.
Installation
To install, reverse removal procedure.
SIDE WINDOW MASTER SWITCH
Removal
1) Disconnect battery negative cable. Remove retaining screws
and escutcheon. Remove switch housing screws.
2) Pull switch out to expose wires. Disconnect terminal plate
from switch. Depress retainer clips through holes in switch housing,
and remove switch.
Installation
To install, reverse removal procedure.
FRONT & REAR DOOR REGULATORS & MOTORS
Removal
1) Raise window half way up. Disconnect battery negative
cable. Remove door trim panel and water shield.
2) Insert a drift punch into hole in door inner panel, or use
masking tape to hold window half way up. Remove regulator arm retainer
clip, and remove arm from bottom window channel.
3) Disconnect wires from motor. Remove inner door panel-to-
regulator nuts and bolts. Remove regulator and motor assembly.
Installation
To install, reverse removal procedure.

reading of .2 volt or less. If reading exceeds .2 volt, clean or
repair cables and connections in circuit. Connect a voltmeter at
following locations:
* Positive lead to battery positive post and negative lead
to cable clamp.
* Positive lead to battery negative post and negative lead
to cable clamp.
3) If reading is other than zero on voltmeter, clean or
repair cables and connections in circuit. Connect a voltmeter at
following location:
* Positive lead to battery positive post and negative lead
to starter solenoid lead to the field coils.
4) If reading exceeds .3 volt, clean or repair cables and
connections in circuit.
SOLENOID TEST
1) Connect a heavy jumper wire on starter relay between
battery and solenoid terminals. If engine cranks, solenoid is okay. Go
to RELAY TEST .
2) If engine does not crank, check wiring and connections
from relay to starter. Repair or replace as necessary. If engine still
fails to crank, starter is defective.
RELAY TEST
1) On automatic transmission/transaxle vehicles, put gear
selector in "NEUTRAL" or "PARK". On manual transmission/transaxle
vehicles, put gear selector in "NEUTRAL". Set parking brake and block
wheels. DO NOT remove relay connector. Using a 12-volt test light,
check for battery voltage between starter relay battery terminal and
ground.
2) Use a jumper wire on starter relay between battery and
ignition terminals. If engine cranks starter relay is good. If starter
does not crank go to next step.
3) Connect another jumper wire to starter relay between
ground terminal and ground. Repeat above test. If engine cranks,
starter relay is good. Inspect transmission linkage for improper
adjustment (automatic transmission), defective neutral safety switch
(automatic transmission) or poor ground connection between relay
housing and mounting surface.
TESTING (ON BENCH)
STARTER SOLENOID
1) With starter removed, disconnect field coil wire from
field coil terminal on starter. Using an ohmmeter, check for
continuity between solenoid and field coil terminals.
2) Check for continuity between solenoid terminal solenoid
housing. Continuity should be present in both tests. If continuity is
present, solenoid is good. If no continuity is present, replace
solenoid. Reconnect field coil wire to field coil terminal.
ARMATURE FOR SHORT CIRCUIT
Place armature in a growler and hold a thin steel blade
parallel 3/16" above core while rotating armature slowly. If armature

STA R TE R R EM OVA L & IN STA LLA TIO N

1988 J e ep C hero ke e
1988 Starters
REMOVAL
All Jeep Models
REMOVAL & INSTALLATION
JEEP
Disconnect battery ground cable. Remove electrical wiring
from starter or solenoid (Bosch). Remove starter mounting bolts.
Remove starter and bracket from bellhousing. To install, reverse
removal procedure. Tighten to specifications.
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS TABLE








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Application Ft. Lbs. (N.m)
Jeep ............................................. 37 (50)









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