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Unread 11-24-2013, 12:41 AM   #1
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1990 XJ Cherokee 
Join Date: Dec 2012
Location: victorville, california
Posts: 39
Electrical Problem!!!

I have a 1990 jeep cherokee xj with an aftermarket radio.
First, the radio started to shut off when I applied the brakes...
Then the dash lights stopped working, and now when i press on the brakes my running lights turn on, and when i pull the knob to turn on my running lights and dash lights, my radio shuts off completely

Its all screwed up and I just want it to work...Any info on this would be greatly appreciated

thanks guys

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Unread 11-24-2013, 04:17 AM   #2
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1995 XJ Cherokee 
Join Date: Sep 2013
Location: Woodbury, NJ
Posts: 65
Take a look at your battery terminals. Are they corroded? Especially the negative one?
Rather be tried by 12, than carried by 6.
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Unread 11-24-2013, 04:37 AM   #3
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1992 XJ Cherokee 
Join Date: Oct 2012
Location: umatilla, florida
Posts: 1,961
Sounds like a floating ground
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Unread 11-24-2013, 06:40 AM   #4
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1990 MJ Comanche 
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 10,938
Radio is wired in wrong.

Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

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Unread 11-24-2013, 07:35 AM   #5
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1996 XJ Cherokee 
Join Date: Sep 2011
Location: guelph, ontario
Posts: 240
Was the dash dimmer wired into the radio? A lot of new aftermarket radios have a built in dimmer function that is digitally controlled. The one in the Xj is an analog(mechanical) variable resistor. The difference in voltages needed to run these are too great for the aftermarket deck to handle so after a period of time, depending on the quality of the deck, the unit will fail. I'm guessing this is why it's affecting your lighting, no guarantees though.

x2 on checking your grounds, battery and alternator terminals also. Never hurts to do regular maintenance on these as Jeeps enjoy clean wiring and dirty paint, not the other way around.
Every man deserves a 'Hummer' once in a while.
But no man should go without a great 'Jeeping' at least three times a week!
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