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Unread 09-10-2004, 06:48 PM   #1
gregoryc.
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Join Date: Sep 2004
Posts: 9
Brake lamp problem

Hello all,
I have a 2000 GC and noticed a problem with the drivers side brake lamp. Lamp works fine normally but when I turn on the headlights and apply the brakes, the brake lamp (running light) goes out instead of illuminating brighter. The passenger side works fine, normally and with the headlights on. Any ideas on where to start looking.
Thanks

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Unread 09-10-2004, 06:51 PM   #2
driabyor
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1994 ZJ 
 
Join Date: Apr 2004
Location: chilton-haynes<$20
Posts: 2,450
replace the bulb maybe!!!
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Unread 09-10-2004, 07:16 PM   #3
Meerkat
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1996 ZJ 
 
Join Date: Apr 2003
Location: Belle, WV
Posts: 4,930
Quote:
Originally Posted by gregoryc.
Hello all,
I have a 2000 GC and noticed a problem with the drivers side brake lamp. Lamp works fine normally but when I turn on the headlights and apply the brakes, the brake lamp (running light) goes out instead of illuminating brighter. The passenger side works fine, normally and with the headlights on. Any ideas on where to start looking.
Thanks

Is this something that just cropped up by itself, or has somebody been working on the rear of the Jeep lately? Say installing a hitch and wiring harness, perhaps?
If no one has done any work back there recently, then the next thing to check is the bulb itself. Make sure it is the right type and has no corrosion. Likewise, check the contacts in the socket for corrosion. Ensure the bulb is inserted correctly. It's difficult, but they can be put in backwards.

If all else fails, swap bulbs from left to right and see if the problem persists.


HTH
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Black 1996 5.2L ZJ Limited
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Unread 09-11-2004, 02:09 PM   #4
gregoryc.
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Join Date: Sep 2004
Posts: 9
Hello,
I swapped the bulb but the problem stayed with the drivers side. I did install, about a year ago, a wiring harness for a hitch. The harness is made by Draw-Tite and was a direct plug-in into the existing Jeep wiring with no cutting or soldering involved. One other thing I noticed last night, my third lamp (on top side of hatch) was burned out. I thought that would solve the problem but after I replaced it the problem was still there. I checked any wires leading to the lens assembly that I could and they seemed fine. I unplugged the D.T. trailer wiring harness and checked the lights but that didn't help.
Thanks
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Unread 09-11-2004, 08:28 PM   #5
greasefingers
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1994 ZJ 
 
Join Date: Sep 2003
Location: Northern VA, USA, NJ
Posts: 8,237
The lamp is a dual filament type. One ground two hot leads & one bulb. It sounds like the second hot (brake induced) goes to ground. I believe the brake switch is proving a high resistance to ground, instead of providing a 12 volt supply...or something along those lines. If you have a multimeter, then I would check this out. It is a mechanical part (something like a sliding cylinder) that provides the switching; when you step on the brake pedal.
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Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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