No running lights or brake lights

work on one thing at a time, brake lights first, check the brake switch, is it mounted ok ? is power geting to it ? replace if any doubt. check all fuses, replace 4-way flasher, cheap fix . a repair manual has good info, including wire diagrams, for all circuits, etc.,,.. check wir harness @ rear of truck, & along frame for damage, corrosion, etc.,.

My guess would be the turn signal switch. A mechanic would check for voltage there.

You may have a bad signal switch..Your brake lights run through the signal switch..Try hitting the brakes and move the switch around and see if your brake lights come on intermittently..

Under the dash just left of the steering wheel.
Cavity Fuse Color Description F1 -- -- Spare F2 -- -- Spare F3 10 Amp Red Headlight high beam left F4 15 Amp Lt. Blue Flasher, hazard switch (see Junction Block diagram above for location of turn signal Flasher relay - Mopar p/n 4686094) (Repair tip: WJ flasher repair)
F5 25 Amp Natural Radio amplifier F6 15 Amp Lt. Blue Park lamps F7 10 Amp Red Interior lights F8 15 Amp Lt. Blue Overhead console, rear wiper, IP lights, rear flipper glass solenoid, power locks F9 20 Amp Yellow Power outlets F10 20 Amp Yellow Adjustable pedals (2002-2004 only) F11 10 Amp Red Rear window defrost indicator F12 10 Amp Red Auto shutdown relay / "Fuel" F13 -- -- Spare F14 10 Amp Red Headlight low, left F15 10 Amp Red Headlight low, right F16 10 Amp Red Headlight high, right F17 10 Amp Red Instrument cluster, diagnostic connector F18 30 Amp ? Trailer tow F19 10 Amp Red Anti-lock brakes F20 10 Amp Red Ignition Run / Heated seats / A/C Heater control / Flasher - Left and Right turn signal switch sense F21 10 Amp Red Ignition Run / Start - PDC (Power Distribution Center) F22 10 Amp Red Ignition Run / Start F23 15 Amp Lt. Blue Brake switch F24 15 Amp Lt. Blue Foglamps F25 20 Amp Yellow Accessory delay relay (sunroof) F26 15 Amp Lt. Blue Cigar F27 15 Amp Lt. Blue Rear fog (export) F28 10 Amp Red Body Control Module, Acc/Run F29 10 Amp Red Rear wiper switch. Washer motors F30 15 Amp Lt. Blue Radio F31 10 Amp Red Ignition Start F32 10 Amp Red Ignition Run / Start - Airbag F33 10 Amp Red Ignition Run / Only - Airbag C1 20 Amp Yellow Wiper (Circuit Breaker) C2 20 Amp Yellow Seats (Circuit Breaker) C3 -- -- Spare

I hope this helps :)

Here is the diagram you were looking for, hope this helps :)


Cavity Fuse Color Description F1 -- -- Spare F2 -- -- Spare F3 10 Amp Red Headlight high beam left F4 15 Amp Lt. Blue Flasher, hazard switch (see Junction Block diagram above for location of turn signal Flasher relay - Mopar p/n 4686094) (Repair tip: WJ flasher repair)
F5 25 Amp Natural Radio amplifier F6 15 Amp Lt. Blue Park lamps F7 10 Amp Red Interior lights F8 15 Amp Lt. Blue Overhead console, rear wiper, IP lights, rear flipper glass solenoid, power locks F9 20 Amp Yellow Power outlets F10 20 Amp Yellow Adjustable pedals (2002-2004 only) F11 10 Amp Red Rear window defrost indicator F12 10 Amp Red Auto shutdown relay / "Fuel" F13 -- -- Spare F14 10 Amp Red Headlight low, left F15 10 Amp Red Headlight low, right F16 10 Amp Red Headlight high, right F17 10 Amp Red Instrument cluster, diagnostic connector F18 30 Amp ? Trailer tow F19 10 Amp Red Anti-lock brakes F20 10 Amp Red Ignition Run / Heated seats / A/C Heater control / Flasher - Left and Right turn signal switch sense F21 10 Amp Red Ignition Run / Start - PDC (Power Distribution Center) F22 10 Amp Red Ignition Run / Start F23 15 Amp Lt. Blue Brake switch F24 15 Amp Lt. Blue Foglamps F25 20 Amp Yellow Accessory delay relay (sunroof) F26 15 Amp Lt. Blue Cigar F27 15 Amp Lt. Blue Rear fog (export) F28 10 Amp Red Body Control Module, Acc/Run F29 10 Amp Red Rear wiper switch. Washer motors F30 15 Amp Lt. Blue Radio F31 10 Amp Red Ignition Start F32 10 Amp Red Ignition Run / Start - Airbag F33 10 Amp Red Ignition Run / Only - Airbag C1 20 Amp Yellow Wiper (Circuit Breaker) C2 20 Amp Yellow Seats (Circuit Breaker) C3 -- -- Spare

Here You are...


Grand Cherokee fuses
1999-2004

Junction Block

Cavity Fuse Color Description
F1 -- -- Spare
F2 -- -- Spare
F3 10 Amp Red Headlight high beam left
F4 15 Amp Lt. Blue Flasher, hazard switch (see Junction Block diagram above for location of turn signal Flasher relay - Mopar p/n 4686094)

(Repair tip: WJ flasher repair)
F5 25 Amp Natural Radio amplifier
F6 15 Amp Lt. Blue Park lamps
F7 10 Amp Red Interior lights
F8 15 Amp Lt. Blue Overhead console, rear wiper, IP lights, rear flipper glass solenoid, power locks
F9 20 Amp Yellow Power outlets
F10 20 Amp Yellow Adjustable pedals (2002-2004 only)
F11 10 Amp Red Rear window defrost indicator
F12 10 Amp Red Auto shutdown relay / "Fuel"
F13 -- -- Spare
F14 10 Amp Red Headlight low, left
F15 10 Amp Red Headlight low, right
F16 10 Amp Red Headlight high, right
F17 10 Amp Red Instrument cluster, diagnostic connector
F18 30 Amp ? Trailer tow
F19 10 Amp Red Anti-lock brakes
F20 10 Amp Red Ignition Run / Heated seats / A/C Heater control / Flasher - Left and Right turn signal switch sense
F21 10 Amp Red Ignition Run / Start - PDC (Power Distribution Center)
F22 10 Amp Red Ignition Run / Start
F23 15 Amp Lt. Blue Brake switch
F24 15 Amp Lt. Blue Foglamps
F25 20 Amp Yellow Accessory delay relay (sunroof)
F26 15 Amp Lt. Blue Cigar
F27 15 Amp Lt. Blue Rear fog (export)
F28 10 Amp Red Body Control Module, Acc/Run
F29 10 Amp Red Rear wiper switch. Washer motors
F30 15 Amp Lt. Blue Radio
F31 10 Amp Red Ignition Start
F32 10 Amp Red Ignition Run / Start - Airbag
F33 10 Amp Red Ignition Run / Only - Airbag
C1 20 Amp Yellow Wiper (Circuit Breaker)
C2 20 Amp Yellow Seats (Circuit Breaker)
C3 -- -- Spare

there is a flasher for both 4 way & regular turn signals ( check to make sure the bulbs are good
the backs are easy >>> Just step on the brake, If the lights light up the bulbs are good you my have to remove the bulbs one at a time in the front check your ground wires to the lights if everything is good replace the flasher unit if that fails replace the turn signal switch

Did you actually check the bulbs? I believe your brake lights, signal lights, hazards all use the same bulb for each side.

Your brake lights may be your brake switch just above your brake pedal.
The signals could be your electronic flasher module (EFM) located under the dash near the steering column.
Your hazards may be affected by the EFM, but not likely and the switch for your hazards may be faulty

Here are the numbers on your fuseblock and fuses coresponding to the number that is on your fuse block.
1-20 amp (yellow)
Hazard flasher
2-10 amp (red)
back up lights, A/C clutch cycling Switch
3-30 amp (green)
Power windows
4-30 amp (yellow)
A/C or heater blower motor
5-20 amp (yellow)
Panel Lights, Side marker lights, Park, Taillights, Clock & radio display Intensity, License & panel lights.
#6-10 amp (red)
Stoplight, buzzers, Anti-lock brake module
#7-15 amp (lt. Blue)
Tachometer, horn & Relay
#8-8 amp (yellow)
Power Door locks
#9-10 amp (red)
Radio
#10-10 amp (red)
Rear Wheel Anti-lock module, Turn Signals
#11-20 amp (Yellow)
Windshield wiper & washers
#12-15 amp ( LT. Blue)
Cigarette Lighter
#13-5 amp (tan)
Speed Control, warning buzzers, gauges, indicator lights
#14-5 amp (tan)
Time/delay relay & under-hood light, dome light, power mirrors, readio & clock Memory, Interior lights, reading lights
#15-blank
Not used
#16-4 amp (pink)
Radio Lights & overdrive switch light 1989-91, Cluster lights, Cigarette Lighter light & as tray light, Cluster lights, A/C & heater controls.
#17-relay
Hazard Flasher warning
#18-relay
Relay
#19-Circuit breaker
#20-relay
Turn signal Flasher
#21-buzzer
Warning
#22-Relay
Horn

I think that your flasher is bad I believe that the 4-ways flasher is a seperate flasher unit it should be in the fuse box and look like the 4-way flasher , to find the flasher turn on the 4-ways and you can feel it or hear it flashing and lok for the flasher for the turn signals
Mike