Wiring issue experience needed
Thread Starter
Senior Member
Joined: Sep 2012
Posts: 509
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From: Largo, FL
Year: 1995
Model: Cherokee
Engine: 4.0 HO
This past weekend, I was putting my dash back together; trying to wire in a USB port to the cig lighter. I got a little lazy and never bothered disconnecting my battery terminal (I work in Avionics, so I am around 115V/400Hz a lot... too used to the zapped feeling), so I ended up sparking a short across the lighter and it took out my radio and cigarette lighter. I went through, both the engine bay and interior compartment panel and found no open fuses. Is the an inline fuse (or something anything) somewhere in the wiring between the fusebox and accessory?
I'm debating on whether or not if I should just run new 12V switched line to them. But, I'm not too keen on adding more wire when not really necessary.
I'm debating on whether or not if I should just run new 12V switched line to them. But, I'm not too keen on adding more wire when not really necessary.
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
It's a fairly short run to trace the leads from your CLA to the fuse box. I would recommend doing that after confirming Freegdr's suggestion to check for +12V on both sides of the fuse. If you've got power on both sides then the failure is in the wiring, I've not seen an inline fuse on any of the items you've listed so the problem lies either with the fuse, the block, or the wiring between the fuse block and the CLA/radio.
Thread Starter
Senior Member
Joined: Sep 2012
Posts: 509
Likes: 0
From: Largo, FL
Year: 1995
Model: Cherokee
Engine: 4.0 HO
Thanks for the input gentlemen; I will look in to that when I get an opp. This Jeep has become a real headache... finding all sorts of problems.
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Senior Member
Joined: Feb 2012
Posts: 864
Likes: 4
From: Arlington, Texas
Year: 1998
Model: Cherokee
Engine: 4.0
As has been mentioned, check fuses for hot on both sides, If they are, try this...
It's not uncommon for the fuse contacts in the panel to become loose and/or oxidized over the years, especially in northern climates. If a fuse was in one of those kinds of situations, the short may have burnt the contacts instead of blowing the fuse. Try removing the fuses and using needle-nosed pliers to adjust the contacts, and make sure they are clean. A small file or tiny flat-head screwdriver with some 320 grit sandpaper over the end works well for this.
I found this out first hand after spending WAY too much time tracking down a weird electrical gremlin.
It's not uncommon for the fuse contacts in the panel to become loose and/or oxidized over the years, especially in northern climates. If a fuse was in one of those kinds of situations, the short may have burnt the contacts instead of blowing the fuse. Try removing the fuses and using needle-nosed pliers to adjust the contacts, and make sure they are clean. A small file or tiny flat-head screwdriver with some 320 grit sandpaper over the end works well for this.
I found this out first hand after spending WAY too much time tracking down a weird electrical gremlin.
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
As has been mentioned, check fuses for hot on both sides, If they are, try this...
It's not uncommon for the fuse contacts in the panel to become loose and/or oxidized over the years, especially in northern climates. If a fuse was in one of those kinds of situations, the short may have burnt the contacts instead of blowing the fuse. Try removing the fuses and using needle-nosed pliers to adjust the contacts, and make sure they are clean. A small file or tiny flat-head screwdriver with some 320 grit sandpaper over the end works well for this.
I found this out first hand after spending WAY too much time tracking down a weird electrical gremlin.
It's not uncommon for the fuse contacts in the panel to become loose and/or oxidized over the years, especially in northern climates. If a fuse was in one of those kinds of situations, the short may have burnt the contacts instead of blowing the fuse. Try removing the fuses and using needle-nosed pliers to adjust the contacts, and make sure they are clean. A small file or tiny flat-head screwdriver with some 320 grit sandpaper over the end works well for this.
I found this out first hand after spending WAY too much time tracking down a weird electrical gremlin.
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