My 2008 Grand Cherokee has a strange problem: the right side rear tail light does not illuminate when you turn on the headlights.
The brake light and turn signal both work - just the running light does not work.
Tried new bulbs, did not work
Swapped sockets from side to side, did not work
All 3 other lights work as intended.
All help appreciated.

Please try the following:
- test to see if the RHS lamp fails to illuminate in the parking light, low beam, and high beam switch positions.
- verify that the RHS assembly ground is intact

I'll look in the '08 WK FSM for clues.

 

Spoke to the service department at the dealer this morning. The service manager says "Is it the RH tail light?".

I say yes, and explain the issue.

He told me that the harness to the RH light is between the body and the spare tire. Sometimes the harness rubs the body, and gets a short.

I will drop the spare tire tomorrow and see if that is the issue.

The fuse is fine, and the socket and bulb have been verified to be OK.

Thanks for the offer to check the service manual.

 

Got out the meter, and checked voltage and grounds.

Grounds verified.

Ther voltage on the RH side is low...about 8 volts.

Still looking.

 

My RH taillight goes out on me randomly. Will blink fast like the bulb is out then will work fine in a couple hours. Sounds like I might have the short described.

 

check this link http://www.wkjeeps.com/wk_fuses.htm

Integrated Power Module 2005-2010 has fuses for each left and right park lamps.

 

The problem has not been solved. The fuses are fine.

I will be doing a complete electrical scan on Wednesday to find the culprit.

 

Problem found and fixed.

 

AND the problem was ??? It would be.appreciated if you let us know what it was just in case someone else develops the same issue. Thanks, Jack

 

yea it would be nice to post how u solved it..

 

I have the same problem, How did you fix it?

 

i have the EXACT SAME PROBLEM but with the left side! PLEASE PLEASE PLEASE post what you found to fix it! it doesnt do any good for you to come on here and ask for help if your not willing to give it! it would only take 30 seconds for you to type what fixed it!!!!!!!

 

i have the EXACT SAME PROBLEM but with the left side! PLEASE PLEASE PLEASE post what you found to fix it! it doesnt do any good for you to come on here and ask for help if your not willing to give it! it would only take 30 seconds for you to type what fixed it!!!!!!!

After a year I doubt he is going to share his secret lol. Did you check the wiring harness with a meter?

 

Same thing with mine.

 

I started having the exact same problem last week. Changing a bulb has solved the problem for now.

 

Yeah i pulled mine apart when i got home and one of the filaments is gone. New bulb it is!!

 

I have a 06 Jeep Grand. The drivers side tail light is out. Backup and blinkers work. I changed the bulb (twice) and cleaned the connectors. Still no good. Anyone have a suggestion? I do have a trailer harness and have removed to test several times. Just to mention the trailer blinkers and brake light do work. Both rear light do not work.

 

Fuse?

 

Anyone who posted have a fix? I'm running into the same issue. I start my vehicle, keeping the turn singal on. Turn signal functions propertly until about one minute after I start it. The blinker signal then speeds up like the bulb is out. I removed the exterior casing/housing of the break light and verifed all wires in tact and undamaged as well as all bulbe being in good condition. This issue casues me some stress as marking right turns can be very dangerous. The only thing I havent checked was the fuse which I will check on my lunch break today.

 

Replace the bulb just to be sure. Filments stretch over time and can lose connection.

 

I have worked on Jeeps as a Mechanic for years, I friend of mine came to me with this same problem of the tail lights (brake lights) intermittently or stop working all together when the headlights are on. Also the blinkers on his did not work. Sometimes it was on the left side sometimes it was on the right. His jeep was an 08 WK limited with the HEMI. There is a few things you need to check before you replace ANYTHING. This does take a certain level of skill and electrical understanding to preform.
1st - check all of your connections as well as the bulbs and the socket that it plugs into, make sure they are making contact.
2nd- Check your wires running from the tail lights, underneath the jeep ( they will run above the spare tire) and on through to the other side. Sometimes they will brake and cause a short.
3rd - This was the last step, I checked the multifunction switch on the steering column and found that it was shorting out. The problem is within the actual switch its self so you will need to replace this in order to correct the problem. This is also a very common problem on WK jeeps, and I have had to replace a lot of them over the years. You must be very careful when replacing these as you do not want to cause any issues with your airbag. Dissconnect the battery for at least 15min before you proceed. The part its self IS VERY SPECIFIC TO YOUR JEEP! so get the part from the dealer or at least get the part number from the dealer. The Part will run between 50-150 depending on year make and model.

If you dont have any brake lights at all or any current flowing to the rear, then check your brake light switch.

I hope that this helps anyone who is having a problem with this! Good Luck!

 

I had the same problem a while back and it was the bulb. For the fuse. There are (3) red 10amp fuses up front of which (2) run the tail lights. You can test the fuses with a multi meter.

 

I'm having this problem on my passenger rear taillight, All I do is take out the bulb and put it back in and it starts working again. Until we hit a bump or something.

 

I had the same issue and posted a solution a few days ago. The rear tail light turn socket needs to be replaced. It's a dealer part none of the auto stores cary it. My part was 14$ at the local dealer, reference part #5 on the pic.

 

Thank you, sorry I missed your post, which thread did you post it in? I assume you had to splice the wires for the new one?

Edit: found your post
http://www.jeepforum.com/forum/f67/tail-lights-signal-problems-1602369/#post17174602

 

Same Problem

Hey all,

I have the same issue described above. The Right Rear signal works in every setting except when the headlights are on. It has been suggested to me to check for rusty connects, but it seems that there must be a wire rubbing somewhere. Has anyone (that responds) solved this issue? Does anyone know where the wired come in contact with the body as described above?

Thanks!

 

Well, I guess I should have read page 2 before posting!