brake wiring problems -
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post #1 of 4 Old 04-04-2014, 07:32 PM Thread Starter
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1986 CJ7 
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brake wiring problems

I have a 1986 CJ7 and have had no brake lights or headlights for at least 2 months now. I have running tail lights and parking lights. i just replaced the stop light switch and the problem still persists. The owner before me did the wiring harness himself and it is a nightmare. can anyone find a diagram where the brake light and headlight wires lead into. PLEASE HELP!!!

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post #2 of 4 Old 04-04-2014, 08:46 PM
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Does the turn singles work as well?
Read this thread and start here.

For the headlights, check for 12volts at the high beam switch (floor pan left), I think the center post.

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post #3 of 4 Old 04-04-2014, 09:19 PM
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Chances are if your jeep has been rewired a diagram will only assist you in understanding how the wiring should look. Assuming your bulbs and fuses are good look at the cluster of wires on the top of your steering column under the dash at about the 1:00 position. There will be a group of six or seven that sit side by side in a row. I think it is the black or gray wire, that is the voltage feed for your stop switch. Better yet test for current 12volts on each side of stop switch without pressing the brake pedal. You should have 12 volts on one side. If not and you have turn signals, I would say your problem is either in the signal switch plug for stop switch or wire to stop switch. If you test stop switch and have 12 volts then depress pedal and check other terminal for 12 volts. If you do have voltage go to brake light and test bulb connection for 12 volts, remember you must have the pedal or switch depressed. If you have current at the brake light bulb socket and no light you have a bad ground. As far as your head lights if you have park then you have voltage to the park side of your head lamp switch. Check the head light side of switch. No current means bad switch. If you do you may have a faulty relay or wire. Check relay for voltage in and voltage out. You can check wires for continuity and determine if the wires are good. Be sure to check condition of ground wires also. chances are, your problem is in the head lamp switch or relay. What ever you do don't get frustrated and quit. Wiring is an animal all to its self. It is one of those things that can be awful simple, yet can turn out to be simply awful.
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post #4 of 4 Old 04-05-2014, 05:58 AM
Mike Romain
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The headlight circuit gets its power direct via a fuse link wire hooked to the fender solenoid. Maybe he forgot to hook it up or blew the fuse link.

On the battery side of the solenoid look for the 6" fuse links. They terminate in big plastic crimp connectors. One is for the alternator, one for the fuse panel and one for the lights if I remember right. Don't have my schematic in front of me though.

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1986 , brakes , cj7 , headlight , wiring diagram

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