91 XJ Fuse blowing

Tiny
OPS5
  • MEMBER
  • 1991 JEEP CHEROKEE
Hi everyone,

I have a 91 Sport 4.0 that has been having some recent problems blowing the fuse that handles the tail lights/instrument panel/parking lights/buzzer. A couple of months ago, this fuse blew, and I replaced it. Everything was fine since until about a week ago; now everytime I pull the headlights on the fuse blows. This happens at the first stop of the pull for parking lamps, with the ignition off. I have not changed anything, such as the radio, and I have manual locks and windows. The brake lights continue to work with the fuse out.

Any ideas how to track down what is causing this?

Thanks,
Phil
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Wednesday, August 22nd, 2007 AT 12:48 PM

3 Replies

Tiny
GRICHARDS
  • MEMBER
This is a test post - I've tried 3 times to post a reply to your question on thurs and friday, but after answering it and clicking on "submit", it's dumped into limbo instead of going to the message board. If this works, I'll try again to post a reply.
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Saturday, August 25th, 2007 AT 6:06 AM
Tiny
GRICHARDS
  • MEMBER
I have a 96 xj style w/ inline6, so my wiring should be similar/same as yours. The brake lights, hazard, turn signal, and back up lights are fused on completely different circuits than the headlights and external parking lights - the parking lights have a fuse, and the headlights have a circuit breaker and a fusible link. When the fuse blows, the brakelights still work, so I'm assuming that the hazard, turn signal, etc. Also still work.(The turn signals and back ups should be "hot" in the Run and Acc key positions) Do your headlights still work after fuse blows? If so, this isolates the problem just to the parking light circuit. If Not, then the headlight switch is most likely the source of the problem.
OK, the possibilities are:
1. The part of the headlight switch that carries the power to the parking lights is shorted internally, blows fuse - Replace switch.
2. There is a short in one of the wires going to a parking light. To check, you'll have to remove the lens cover and light housing/assembly on each light that doesn't work when fuse blows and check the wires for breaks, moisture providing a path to ground, etc. Do this one at a time with each light until you find "the problem".
3. If you've had an accumulation of moisture in your floorboard(s), under body trim in door frame at bottom of door opening, you might have a bad connection that water touches and provides the perfect medium for a path to ground on the frame.
Hope this helps. Good Luck!
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Saturday, August 25th, 2007 AT 6:39 AM
Tiny
OPS5
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Thanks for the input. You confirm what I've been thinking- the trick is figuring out where the problem is. Hopefully tomorrow I'll get the time to pick over everything and see if I can find the problem.

I'll update if I figure it out

Thanks
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Saturday, August 25th, 2007 AT 8:13 AM

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