Question about 1985 Jeep CJ7

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Headlights cut off while driving

I have a 1985 CJ-7, my problem is the headlights will cut off after about 15 minutes of driving. It does not matter if the engine is running or not once this starts to happen they just switch on and off like I am flashing for a cop or something. Switching the high beams on seems to bring it on also. Only the headlights are affected, the parking lights and tail lights all work. I asked a mechanic friend about it and he said it is not a short but a ground problem. Does this sound right? If so, where do I find the ground wires to check them? Once this starts, if I let it cool down for a couple of minutes, then its ok again for a little while. Thanks Terry

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Check you high\low beam connector...I had the same problem with mine and it was in that connector

Posted on Mar 17, 2009

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Just replace your headlight switch, mine use to do the same thing. There cheap, you can get one at your autoparts store and it take 5 mins to put it in.

Posted on Dec 24, 2008

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If it is truly a ground problem you should be able to do the following.

NOTE* Sometimes finding the root of a ground problem in a wiring harness can be very time consuming and also drive you nuts.

First you need to establish if it is indeed a ground problem.
Check your fuses and make sure that none of them are bad or loose.
Look at the back of the headlight switch and determine if the connection is solid.
Do the same with each headlight. If you find a dirty connector then clean it gently and re-connect it.
Try the headlights again... If the same thing happens continue.

IF YOU ARE NOT MECHANICALLY INCLINED, FIND SOMEONE WHO IS FOR THE NEXT PART!

On the headlight connector there are usually 3 wires. 1 low beam, 1 high beam, and 1 ground,
Find the ground wire from the headlights and provide a solid temporary ground by adding an additional
wire into the ground socket. DO NOT CUT EXISTING ELECTRICAL WIRES ON YOUR CAR!!! Get a length of Electrical wire and strip off about 1 inch of the coating from each end. Find which socket is the ground, and slip the new wire into the socket with the bulb.
Take the other end of the wire and fasten it to a grounded area, "something made of steel, like the frame or part of the engine. NOT ALUMINUM...

Try the headlights again... If it works ok then you do have a ground problem.
The options now are to either secure everything down "as is" and consider it fixed, or, take it to a shop and have them fix the ground the way it should be fixed.

This is only ONE way to diagnose a ground problem but NOT the only one.

If it does not work then it is something else other than a ground, like a switch.



Posted on Nov 22, 2008

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