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Unread 10-17-2011, 04:41 PM   #1
CJ Runner
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1978 CJ5 
 
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Location: Maryland
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Headlight ground

All lights except my headlights and front parking lights work on my 78 CJ5. The side parking lights are pretty dim. I see on my harness that there are three wires going into the headlight. I'm assuming one is low beam power, one is high beam power, and one is ground. Is the headlight frame supposed to be grounded for them to com on?

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Unread 10-17-2011, 04:49 PM   #2
redman87
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1964 CJ5 
 
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Yes the grill/radiator support should be grounded. But your lights should still work. I would start with checking the head light switch, fuses, and anywhere the wires may touch any sharp edges

Last edited by redman87; 10-17-2011 at 05:00 PM..
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Unread 10-17-2011, 04:54 PM   #3
redman87
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Yes the grill/radiator support should be grounded. But your lights should still work. I would start with checking the head light switch, fuses, and anywhere the wires may touch any sharp edges.
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Unread 10-17-2011, 04:58 PM   #4
redman87
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Sorry about the double post having some wifi trouble
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Unread 10-17-2011, 05:12 PM   #5
bentring
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Here's a good thread you should read if you have problems with grounds.
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Unread 10-17-2011, 05:19 PM   #6
ODGREEN4X4
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1984 CJ7 
 
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Head lights

Take a test light to the wires or clip and see if there is any positive power(ground to the neg batt term). 1 wire should be high and one should be low beam. If there is power- take the test light ( off the batt ground ) and ground it to the other wire /clip .if the power goes out it is the ground. This will tell you if it is a ground or hot wire issue. assuming all the bulbs are good. Don,t laugh it happened to me.
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Unread 11-16-2011, 05:30 PM   #7
CJ Runner
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I grounded my test light to the negative terminal of the battery and touched the test light to the parking light and it lit up. Did the same to the headlight and got nothing. I checked to see if power was going through the headlight fuse and it was. When I touched the test light on the engine compartment side of the fuse block where the headlight wires terminate into the fuse block I got nothing

Not really what to check from here, any advise is appreciated.
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Unread 11-16-2011, 06:31 PM   #8
addicted2dunes
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Sounds like your dimmer switch (switch on the floor to switch between hi/lo beams) is bad. Check for power at the dimmer switch, plug looks like this:



If you have power in the center wire terminal then try a jumper wire from the center terminal to one of the other sockets and see if you get lights, oh yeah, when testing all of this make sure the headlight switch is on. If you don't have power at the dimmer switch it'll then move you to diagnosing the headlight switch.
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Unread 11-16-2011, 06:36 PM   #9
addicted2dunes
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Do the taillights work? If not it sounds like it might be your headlight switch.......
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Unread 11-16-2011, 06:59 PM   #10
CJ Runner
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You are the man...time for a victory beer. It was the dimmer switch, swapped in a spare and they lit right up; thanks!!
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