headlights shut off when i brake - JeepForum.com
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post #1 of 5 Old 01-18-2010, 04:50 PM Thread Starter
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1974 CJ5 
Join Date: Oct 2009
Location: Atlanta
Posts: 37
headlights shut off when i brake

All of a sudden when I brake, my headlights shut completely off. When I release the brake pedal, the lights come right back on in full force. It is definitely not a bad battery, it is fully charged and I threw another one in there just to be sure. It is also not a dimming effect. They shut COMPLETELY off. When I push the brake, there is a spark on the wires that run to the amp meter on my dash. the amps go straight to zero, as if I had an open wire touching metal. The spark is rather large and the bolt it attaches to seems to gets red hot immediately. Are the wire(s) going to the amp meter just attached with a bad connection? Is it possible for a spark to occur right there but the short be somewhere else? The wires going to the amp meter seem to be a larger gauge than most other behind my back. is it back to disconnect these all together? Sorry for so many questions but I am not great with wiring. Thanks.

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post #2 of 5 Old 01-18-2010, 07:28 PM Thread Starter
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1974 CJ5 
Join Date: Oct 2009
Location: Atlanta
Posts: 37

nevermind. Found the issue. the brake wire was crimped under the body due to the way it was routed. when i pushed the brake it was shorting it out.
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post #3 of 5 Old 01-18-2010, 09:06 PM
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1979 CJ7 
Join Date: Dec 2009
Location: Chesterton Indiana
Posts: 84
Well now you've got one for " you know you drive a cj when" lol.
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post #4 of 5 Old 01-18-2010, 09:58 PM
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1995 XJ Cherokee 
Join Date: Aug 2009
Location: NW Pennsylvania
Posts: 1,754
"Sir, what seems to be the problem?"

"I can't stop."


"My headlights shut off"

95 xj bone stock for now
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post #5 of 5 Old 01-19-2010, 07:09 AM
Mike Romain
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1986 CJ7 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant
Posts: 18,083
That 'spark' point is going to cause you troubles. It is a bad connection waiting for a bad time to fail, like in a snowstorm or rainstorm or middle of a swamp or...

If you can see the arc under large load, the connection should be taken apart and cleaned and tightened well.

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