headlight high-low beam problem - Team Camaro Tech
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post #1 of 6 (permalink) Old May 26th, 09, 05:22 AM Thread Starter
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Craig
 
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headlight high-low beam problem

I have installed a new wiring harness as well as a new dimmer button in my 68. I'm not sure if the high beam or the low beam is working but the other is not. I thought it was my dimmer button and replaced it still to have the same problem. Any suggestions? Thanks for any help.

Craig

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post #2 of 6 (permalink) Old May 26th, 09, 10:35 AM
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Re: headlight high-low beam problem

Wow, that is a common problem. I have the same issue (high-beams work/low-beams don't work). Like you I replaced the dimmer switch and it did not help.

I haven't got around to it yet, but next I will be checking all grounds and contacts.
There is also an outside chance that either hi or low filaments in both headlights could be shot.

1969 Camaro SS, 350(NOM), M21, 12 Bolt Posi, 01B LOS Build
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Last edited by 77thor; May 26th, 09 at 03:32 PM.
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post #3 of 6 (permalink) Old Jun 12th, 09, 05:14 AM
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Re: headlight high-low beam problem

Weird.... I found the problem with my 69 Camaro....
if I pulled back the carpet to expose the dimmer switch, my headlights would work OK (standard & high-beams).
Apparently the switch was hanging up on the rubber carpet grommet. I pulled that grommet out of the carpet, re-installed carpet without the grommet, and it works great now.

1969 Camaro SS, 350(NOM), M21, 12 Bolt Posi, 01B LOS Build
1977 Camaro, 350(LM1), M20, 10 Bolt Posi, Purchased New, (SOLD)

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post #4 of 6 (permalink) Old Jun 12th, 09, 07:56 AM
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Re: headlight high-low beam problem

Run a short single ground wire from the switch-screw into another seperate screw into your floor pan. I bet its a ground issue too. Make sure you have ground straps from frame to body or engine to body as shown in the AIM too.

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post #5 of 6 (permalink) Old Jun 12th, 09, 09:01 AM
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Re: headlight high-low beam problem

Quote:
Originally Posted by click View Post
Run a short single ground wire from the switch-screw into another seperate screw into your floor pan. I bet its a ground issue too. Make sure you have ground straps from frame to body or engine to body as shown in the AIM too.
No grounds involved in the dimmer switch. I agree could be ground problem but I put my money out by the lights. First thing I would do is check to see what has power at the headlight and work back from there.

Jeff
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post #6 of 6 (permalink) Old Jun 12th, 09, 11:27 PM
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Re: headlight high-low beam problem

Grounds on the lamps only, and both filaments share the same ground. If one brightness level works, the other brightness level should work also. If the working brightness was dim, I'd think more about the ground. The only way to know for sure what's going on is to put a DVM on it and measure voltages while looking at the schematic for reference. Problem is likely associated with the floor switch, but no grounds there except for the lamp buckets themselves.

Dave
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