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post #1 of 5 Old 03-03-2013, 07:37 PM Thread Starter
BryceBrown
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1987 XJ Cherokee 
 
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tailights not working

Ok so I have an 87 jeep cherokee and am getting no tail or brake lights and no dashlights the fuse is good it was popping the fuse untill I changed the headlight switch the fuse stopped poping but the taillights or dash lights will not work I also replaced the brakelight switch what else can cause this the bulbs are fine and the wiring does not seem to be burnt up

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post #2 of 5 Old 03-04-2013, 05:24 AM
xjfever
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If you have meter you can test for voltage at the tail lights, and work your way up through each connector until you find where it is lost. This is how I usually diagnose any wiring issues.

  1. '95 XJ country edition, 4" coils/3/4" spacers, HD leafs with extra main added in, Ironman adjustable control arms, rough country shackles, aussie locker, JK rubicon shocks, 35" mudder's, soft 8's, cobra cb
  2. Sold'99 WJ limited, 4.7L, 3" IRO lift. Bilstein shocks, JK rubicon wheels, 255/70/17's, carolina driveshaft, IRO adjustable control arms, IRO adjustable A-arm
  3. Sold '00 TJ, 4" lift, rusty's adjustable control arms, skyjacker shocks, rock krawler adj. trac-bar,rugged ridge SYE and RE driveshaft, soft 8's, 35" mud king xt's,XJ HP D30 w/aussie locker, 4:88 yukon gears, hella 500's, rock crusher diff covers
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post #3 of 5 Old 06-07-2013, 08:22 AM
RStanger
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1999 XJ Cherokee 
 
Join Date: Jul 2011
Location: Anderson
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Had a similar problem, fixed it.

I have a 99 XJ that lost the front running lights, dash illumination, and tail lights.
I checked the two fuses in the fuse panel inside the vehicle (#7 and #23 for the 99 XJ), they were good.

Using my VOM and a wiring diagram, I checked for output voltage (blk/yel wire, I think for the 99) at the H/L switch: 0 volts. Ah-HA!
I replaced the H/L switch with a known good one, no change.

Referring once again to my wiring diagram, I checked for voltage coming INTO to H/L switch for the lights that are out (tan/? wires, for the 99):
0 volts. Hmm...

....back to the wiring diagram. What's ahead of the H/L switch that feeds current through the tan/? wires?

It seems there is a mysterious "fuse #17, 20 amp" before the H/L switch.
Interior fuse box has a #17 fuse, but it is clearly NOT for the dead lights, according to my wiring diagram.

I check the "main" fuse box under the hood. No numbering there just the goofy list inside the lid, and some of the fuses aren't identified at all.
So I checked every 20 amp fuse I saw there, and voila! I found a blown 20 amp fuse!
I replaced it with a spare, and everything is back to normal!
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post #4 of 5 Old 06-07-2013, 08:56 AM
cruiser54
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1990 MJ Comanche 
 
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Quote:
Originally Posted by BryceBrown View Post
Ok so I have an 87 jeep cherokee and am getting no tail or brake lights and no dashlights the fuse is good it was popping the fuse untill I changed the headlight switch the fuse stopped poping but the taillights or dash lights will not work I also replaced the brakelight switch what else can cause this the bulbs are fine and the wiring does not seem to be burnt up
I got a headache reading this.
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If you own a Renix Jeep, you'll want to check this out.

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post #5 of 5 Old 06-07-2013, 08:56 AM
cruiser54
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1990 MJ Comanche 
 
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Got some hacked up trailer wiring plug/harness on it?

If you own a Renix Jeep, you'll want to check this out.

An index to over 30 write-ups can be found in the link below

www.cruiser54.com

My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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