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bill, jeep master tech
Category: Jeep
Satisfied Customers: 1627
Experience:  25 years with jeep drivability and electrical expert
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, my taillights do not come on while the headlights are

Customer Question

Customer: ***** *****
JA: Thanks. Can you give me any more details about your issue?
Customer: my taillights do not come on while the headlights are on. its a 2000 jeep grand Cherokee
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Submitted: 1 year ago.
Category: Jeep
Customer: replied 1 year ago.
brake lights work fine but the taillights do not come on
Expert:  bill replied 1 year ago.

ok I need a bit more info is it the REAR only or the front and rear park lamps that do not come on?

and what is your skill level can you use a digital meter and test lamp for some testing?

Customer: replied 1 year ago.
I have a tester with a ground wire and a light. I am intermediate skill. The parking lights (yellow) in front do not come on. The rear red taillights also do not come on.
Customer: replied 1 year ago.
The yellow front lights will flash when emergency lights are on and with turn signal also
Expert:  bill replied 1 year ago.

ok last thing do you have the vin so I can pull the correct diagram for your jeep?

all our diagrams are vin specific

Customer: replied 1 year ago.
I can not drive at night because red tail lights do not come on. only my headlights come on. The brake lights work when I step on the brake.
Customer: replied 1 year ago.
I will get the vin. just 2min
Expert:  bill replied 1 year ago.

take your time

Customer: replied 1 year ago.
Expert:  bill replied 1 year ago.

thanks give me a couple of seconds to pull a diagram

Customer: replied 1 year ago.
Expert:  bill replied 1 year ago.

ok first thing is to look at the park lamp fuse in the INTERIOR fuse panel, that panel is on the drivers side just above the OBD 2 diagnostic port it MAY or MAY NOT have a cover over it, the fuse to look at is FUSE 6 and it is a BLUE 15 amp fuse, this fuse feeds the park lamp relay which feeds all the parking lamps front/rear and license plate lamps

Customer: replied 1 year ago.
ok I will check now...
Expert:  bill replied 1 year ago.

ok if that fuse is good you will need your teat lamp to see if the relay is getting power

Customer: replied 1 year ago.
ok that fuse was blown and I just now replaced it and now the red tail light comes on and the yellow running light comes on with the headligthts. It all works now but when the headlights are on and I push on the breaks, the brake lights do not come on and the tail lights go off completely. When I let of the brake the tail lights come back on
Expert:  bill replied 1 year ago.

ahh a very common problem, the tail rear tail lamps lamp housings contain a printed circuit board (kinda like many GM trucks) and that circuit board goes bad, USUALLY the ground circuit fails in some way, which causes the power to seek the next available easiest ground path, and when that happens you lose what ever lamps are on at the time, it is MOST noticeable withteh parking lamps on and when you step on the brakes, the brake lamp bulb completes the ground BUT this causes the lamp to go out, the ONLY successful fix I have had was replace the lamp assemblies with either good later model used ones (2002 and up should be ok) or new ones, I have yet had any success in taking apart the lens and fixing the board

Customer: replied 1 year ago.
ok I guess I will try going to autozone. with this discussion be saved so I can get back with you if it doesn't work? thanks
Expert:  bill replied 1 year ago.

yes it is saved just log in to your account and click the my questions tab, be careful with auto zone stuff I have had spotty luck with them you MAY be better and cheaper finding a used set from a later model GC

Customer: replied 1 year ago.
also are the led light assemblies any good or does led cause problems. thanks
Expert:  bill replied 1 year ago.

my girl has LED on her 02 GC with no issues BUT you need to be sure the ones you get have the correct LOAD RESISTORS built in or you will get a hyper flashing turn signal if they work at all,remember your GC was never designed to have a low resistance lamp like a LED (traditional filimant style lamps put a fairly heavy load on the circuit and th eflasher needs this load to operate correctly) so the flasher will not operate properly unless the lamps have the correct load to put on the flasher, as with any aftermarket part be careful of discount parts they are cheap for a reason.

Customer: replied 1 year ago.
ok thanks a lot. good job!
Expert:  bill replied 1 year ago.

your welcome have a good Christmas

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