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Strange lighting problem

Posted By: Dougsmopars

Strange lighting problem - 07/28/13 07:04 PM

My 68 Super bee has a strange lighting problem. When you turn on the head lights to parking position all the side markers light up. When you turn the head lights on the front side markers go out. Car has all new wiring harness under hood and new head light harness. No cut or spliced wires. All plugs are pluged in. Is there any difference between 68 and 69 head light switch? I didn't build this car i bought it done. The wire harness are aftermarket but i don't know what brand.
Posted By: NITROUSN

Re: Strange lighting problem - 07/28/13 07:06 PM

You are losing or missing a ground.
Posted By: Dougsmopars

Re: Strange lighting problem - 07/28/13 07:09 PM

Where? Side markers are grounded to fender and do light up in park position. Go out with headlights
Posted By: NITROUSN

Re: Strange lighting problem - 07/28/13 07:16 PM

Quote:

Where? Side markers are grounded to fender and do light up in park position. Go out with headlights



Did you verify you are losing power at the side maker wire with a test light or voltmeter? What are the park lights doing?
Posted By: Dougsmopars

Re: Strange lighting problem - 07/28/13 07:19 PM

Yes i lose power at front side markers when headlights come on. All the other parking lights work fine.
Posted By: That AMC Guy

Re: Strange lighting problem - 07/28/13 07:33 PM

Sounds like something might be wrong with your new harness. On a '68, the side markers should all come on in either headlight switch position. However, the parking lights in the front bumper will ONLY illuminate in the "Park" position. The parking lights turn off when the headlights are turned on.
Posted By: NITROUSN

Re: Strange lighting problem - 07/28/13 07:45 PM

Quote:

Sounds like something might be wrong with your new harness. On a '68, the side markers should all come on in either headlight switch position. However, the parking lights in the front bumper will ONLY illuminate in the "Park" position. The parking lights turn off when the headlights are turned on.



That's what I was thinking. The front marker and park circuits are reversed. Most likely at the panel light connector. The green with a tracer is the front side marker circuit and it is shared with the black rear tail circuit at the panel switch. Here is a diagram.

Attached picture 7793310-68CoronetA.JPG
Posted By: NITROUSN

Re: Strange lighting problem - 07/28/13 07:52 PM

They also could be switched at the bulkhead. Terminals U and Z need to be verified on both sides of the bulkhead. The Park should be black with a yellow tracer terminal location U. Side marker is dark green with a tracer terminal location Z.

Attached picture 7793317-68CoronetBfront.JPG
Posted By: Dougsmopars

Re: Strange lighting problem - 07/28/13 07:57 PM

Thanks. I'll check the bulk head conector and see if new harness is correct.
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