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I've got a 2001 WJ 4.0, The right brake light wasn't working, so I installed a new bulb, but I must have done something in the process because now all my brake lights work but I have no running lights. My dash lights all work, and I can't find any blown fuses.

Edit:Brake lights, turn signals, and reverse lights all work, but no running lights which are the same bulb as the brake lights. Does anyone know which fuse(s) I should inspect specifically? The fuse chart is cryptic at best, this weekend I may eventually resort to scrutinizing every fuse in the jeep.

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Check the wiring you may have moved during replacement, maybe there's bad contact or something. – Kromster Dec 20 '12 at 9:13
up vote 5 down vote accepted

Its fairly common for these to burn out sockets for the bulbs, and even often on both sides at the same time. The socket can be removed asa separate piece, and it is fairly likely melted and/or burned

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Do you think I should try getting two of these?… – hillsons Dec 20 '12 at 20:31
I would check it first. If they are burned out, check for voltage where they are installed as in rarer cases a whole lens is needed – Drake Clarris Dec 20 '12 at 20:39
I think you're really on to something here. I was able to get the right brake light and tail light to work completely by forcefully reinserting the socket several times, leading me to believe that the socket contacts are burnt or old. – hillsons Dec 21 '12 at 4:55
Like I said, I've seen it a lot – Drake Clarris Dec 21 '12 at 6:20
I've had intermittent connection problems with thermally damaged sockets. You can try cleaning the contacts and adding dielectric grease, but it's easier to just replace the socket if you've got a part available at a reasonable cost. – Mark Johnson May 28 '13 at 20:20

If the tail lights were hot during the swap you may have broken the filiments. Bumping a bulb that is on or been on recently can cause the filiments to fail. Remove the bulbs hold them up to a light and see if the filimant is intact.

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Sorry mate, it's not the filaments. These are new bulbs, remember? It's possible the bulbs are somehow otherwise faulty, but a simply broken filament isn't what's giving me grief. – hillsons Dec 21 '12 at 4:52

Also check the relay under the dash for the parking/running lights, I just fixed one in my shop 10 mins ago that needed the relay and new bulbs (bad bulb on one side caused all brake/run lights to go out if the running lights were on when applying the brakes) also check the sockets and contacts as well

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