Interior lights Going Crazy, Where is GND - Team Camaro Tech
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post #1 of 6 (permalink) Old Apr 27th, 13, 02:23 PM Thread Starter
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Interior lights Going Crazy, Where is GND

1969 Camaro...Working on interior instrument lights and fuel gauge going south when I turn on headlights while car is running (But only with car running, if car is off and ignition turned on the lights and gauge are fine). High beam, turn signals, gen start to light and fade in and out. Fuel gauge fine with lights off. Figure it has to do with the light switch ground which I did find play in the ground wire that is attached to the light switch bracket (fixed that, haven't tested to see if that was the problem).

My main question, looking at the wiring diagram all the grounds come together and stop...where does the interior electrical ground come from? I see the black wires going into the wire bundles (which are all taped) but where do they terminate to bring ground to the interior? Would like to check all that before putting dash back on.

Thanks for any help, Dave

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post #2 of 6 (permalink) Old Apr 27th, 13, 02:45 PM
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There is a major ground at the headlight switch mounting point. I would start there.


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post #3 of 6 (permalink) Old Apr 28th, 13, 07:53 AM Thread Starter
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Re: Interior lights Going Crazy, Where is GND

Thanks, that is the one I fixed, looking for any other grounds under the dash.

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post #4 of 6 (permalink) Old Apr 28th, 13, 10:45 AM
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Well the instrument lights and gauge cluster lights all ground to the housing. Check for rust and grime in those locations.

You said only when headlights are on - doesn't happen with just the parking lights on?


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post #5 of 6 (permalink) Old Apr 28th, 13, 12:18 PM Thread Starter
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Re: Interior lights Going Crazy, Where is GND

Never tried with just parking lights. According to the wiring diagram, all the grounds come together and then there are two wires going to chasis ground, one is the Panel Brace Ground (Which I assume is the light switch bracket) and the other, the one I am looking for, is called Instrument Panel Ground. The black wires from the instrument lights go into the covered wire bundles and I really do not want to take the bundles all apart to trace the wires, was hoping someone knew where that second termination point is.

I have ohmed my grounds (Battery to block, block to chasis and black wires to chasis) and they appear to be good, guess the next step is to put it all back together and take it out for a test drive...just want to find that other ground connection so I can clean it.

Dave

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post #6 of 6 (permalink) Old Apr 28th, 13, 02:59 PM Thread Starter
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Re: Interior lights Going Crazy, Where is GND

Just an update...took the wire bundles apart, all the grounds come together inside the bundle. Then there are two ground wires that come from that group and are attached to the chasis, one is behind the heater controls, attached to the same bracket that the flasher is on. The other I am not sure exactly where it is attached because I found mine tucked up in the dash (not connected) with the terminal covered in electrical tape??? What I did find is the wire on the flasher bracket was loose. Since that was my only ground attachment I'm pretty sure that will be my problem.

Dave

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