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Old 11-26-2011, 12:55 PM   #1
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Fuse Question

2001 TJ - 4.0
#7 fuse in block behind glove compartment. It is for backup lights and ABS. 10 amp fuse is whats called for and every one you put in will blow when you turn the ignition on. Any ideas????

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Old 11-26-2011, 01:10 PM   #2
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According to the FSM for your TJ the following is a list of circuits energized by the #7 fuse circuit:
1. Antilock Brake Controller,Antilock Brake Relay (in the PDC)
2. Rear window defogger relay (in the PDC)
3. Park/neutral position switch
4. Back up lamp switch

I'd start checking the related circuits that way you will be more than likely be able to narrow down the search for the cause of the short circuit.

*WHATEVER YOU DO DON"T PUT A HIGHER RATED FUSE IN THE BLOCK, THIS COULD START A VEHICLE FIRE*

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Old 11-26-2011, 01:35 PM   #3
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The way I troubleshoot circuits like that is is to disconnect all the circuits I can get to and seeing if the fuse still blows. That means pulling the plug to the circuits I can get to or removing the bulbs in other circuits controlled by the fuse that is blowing. Then reconnect the circuits or replace removed bulbs until the fuse starts blowing again. That is a quick way to isolate the problem down to the one that is blowing the fuse. I had one like that recently that was blowing a fuse in my Toyota and it turned out to be a bad bulb socket.
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Old 11-26-2011, 03:09 PM   #4
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Fuse Question

OK, according to the diagram on the PDC lid the ABS Relay is not there and I can't find one labeled for the rear window defogger. I guess I'll move on to the switches and see if I can locate them.
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Old 11-26-2011, 05:25 PM   #5
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Does your TJ have ABS and/or a rear window defogger?
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Old 11-26-2011, 05:52 PM   #6
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Fuse Question

Well I knew it didn't currently have a rear defroster (always a soft top) but I erroneously ass-umed it would have abs systems. After checking my build sheet I see I ass-umed wrong.

Will I most likely have trouble getting to and disconnecting the switches to test them? Sorry for all the trouble but I am learning.
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Old 11-26-2011, 06:07 PM   #7
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At this point, since you just confirmed you don't have ABS or a rear window defogger, I'd be looking at the backup lights and backup light bulb sockets themselves. Pull the backup lights out and see if the fuse still blows. That may help isolate the problem to the backup lights themselves or elsewhere.
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Old 11-26-2011, 07:10 PM   #8
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It's amazing what a little lack of noise and darkness can do for testing. I took both backup bulbs out and the fuse still blew. This time though it's pitch dark outside and I actually shut all the doors on the jeep. You can now hear a slight pop and see a quick flash as soon as you put it in reverse. I tried it with bulbs out and bulbs in to make sure. Same pop and same flash as soon as it hits reverse.

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