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Old 11-11-2014, 12:00 AM
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Red face Electrical malfunction: I'm stumped!

Hello! New to the Jeep and new to the forum. Recently (30 days ago) purchased a 2001 TJ and have been upgrading this and that ever since. I added a CB radio, some LED lights and a really nice subwoofer/amp setup in the back. I'm allllllmost done, but I've run into a minor glitch.

Today I was adding a switch controlled relay under the hood when apparently I accidentally grounded out my 12v power source. Everything I have added to the front end is powered through the unused rear window defogger / wiper relay station in the PDC under the hood. Plenty of amperage available for the relatively low current LED lights and radio, but I was going to use a relay anyway. So I accidentally grounded out my power source, and now nothing that I have connected to that source works. The 30A fuse I had installed in line is intact, so whatever blew was less than or equal to 30 amps. I checked ALL the fuses in the PDC and the fuse box behind the glove box, NONE of them are blown, and I mean I looked very carefully.

Is there a "hidden" fuse somewhere in this circuit, maybe an inline one somewhere? Everything else electrical works fine... all lights, radio, HVAC, horn... everything! Bypassing the HDC(?) terminal in the power distribution center gets everything back working again, and I've taken a meter to the terminal I was using in the SDC to confirm that I am NOT getting 12v there.

I've got a degree in electronics and about 40 years experience working cars and trucks in general, but this is my first Jeep. BTW, I absolutely love working on this thing. Everything is easy to get to. But here must be a fuse somewhere that I don't know where to look. I heard a faint "pop" when my wire shorted to ground and I THINK it came from inside the cabin. No smoke (that would have made it too easy), just the faint "pop" sound.

Any help appreciated, as I would like to keep my convenient power source where it is at.

Dave

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Old 11-11-2014, 12:27 AM   #2
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Old 11-11-2014, 12:23 PM
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Oops... and thanks!
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