Rear turn signal and brake light short - JeepForum.com
 
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post #1 of 14 Old 12-28-2015, 03:55 PM Thread Starter
Twanner
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Rear turn signal and brake light short

I'm having trouble with my 04 TJ. When it gets really cold (20 degrees or colder) both rear turn signal lights flash at the same time, but the front works fine. Also, when this happens, if I hit the brakes with the blinker on the blinkers all stop flashing completely. Even the dash light for the turn signal stops flashing and ticking.

Any advice on what could be causing this? I find it really strange that it only seems to happen when its bitter cold out.


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post #2 of 14 Old 12-28-2015, 09:52 PM
Cuder
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I would bet your multifunction switch has gone bad. It's under the steering column cover, your brake lights, tail lights, hazards, and turn signals function thru it. It's easy to replace, three screws in the bottom cover and two torx screws hold the switch in.

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post #3 of 14 Old 12-29-2015, 03:41 AM
Jonny Jeep
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I'm with Cuder on this one. Temporarily, until you can replace the switch, you could try cycling the hazards on and off several times to see if that will help.
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post #4 of 14 Old 12-30-2015, 10:44 AM Thread Starter
Twanner
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Thanks for the input guys. I'll check it out. I was thinking that it could be a bad ground somewhere, but I'm hoping it's just the switch because that will be much easier to fix.

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post #5 of 14 Old 12-30-2015, 11:17 AM
TheBoogieman
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X 3 on that diagnosis.

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Originally Posted by jeepinmichguy_ View Post
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post #6 of 14 Old 12-31-2015, 10:34 AM Thread Starter
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Cycling the hazards doesn't seem to help. Just to be sure, I cycled everything a few times and nothing. Got a new switch on order, should be here in a few days.

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post #7 of 14 Old 01-06-2016, 11:33 PM Thread Starter
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It wasn't the multifunction switch. I replaced it tonight and the problem persisted. My next try will be the break solenoid switch under the break pedal.

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post #8 of 14 Old 01-07-2016, 12:15 PM
williamb81
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I had very similar issues and would have bet it to be the multifunction switch as it fixed my issue. Please keep us updated as to what you find. Thanks.
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post #9 of 14 Old 01-07-2016, 10:18 PM
jpfelix
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check the grounding at the taillights and trailer harness, if installed. they ground through the mounting bolts and can act up from time to time.
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post #10 of 14 Old 01-08-2016, 11:30 AM Thread Starter
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Quote:
Originally Posted by jpfelix View Post
check the grounding at the taillights and trailer harness, if installed. they ground through the mounting bolts and can act up from time to time.
I tried replacing the stop light switch and that didn't fix the problem either. Checking the grounding for the trailer harness and the tail lights was going to be my next move.

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post #11 of 14 Old 01-08-2016, 02:13 PM
DilutedImage
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It's interesting that this only occurs at such low temperatures. I'd look for contacts/components close enough to be effected by thermal contraction, or perhaps a short being created by water/ice.
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post #12 of 14 Old 01-08-2016, 03:45 PM
Jerry Bransford
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Make sure both tail light housings are well grounded which is accomplished via the three hex-head bolts under the red lens cover inside both tail light housings. Use a wrench or nutdriver to loosen/tighten all six bolts a few times and then secure them so you're sure they're making a good ground connection to the tub's sheet metal for the tail lights. Bad/weak/intermittent grounds between the tub and tail light housings can cause all kinds of weird tail light problems.

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post #13 of 14 Old 01-08-2016, 05:02 PM
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I was having a minor problem with the left blinker lighting up when braking so as Jerry suggested I removed both rear fixtures and ran a tap thru the body threads and cleaned up the bolts on the wire wheel and re-installed. Problem disappeared after that.

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post #14 of 14 Old 01-13-2016, 01:26 PM Thread Starter
Twanner
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Fixed the issue. Terminals on the trailer harness were burnt out and a couple of them were fused together. Replaced the trailer harness and everything is all good.

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brake light , short , tail light , turn signal

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