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Old 12-29-2007, 02:42 PM
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Bonneville Tail Light and Turn Signal Problem

Hi,

I am having a problem with the rear lights on my 1968 Bonneville. If the brake lights are on and I turn the left turn signal on, the right brake lights go out. I have changed the tail light sockets to the Ford style that are all metal in order to ensure I have good grounds, but the problem still exists. Does anyone have any ideas?

All of the lights are good and bright since I changed the sockets, and all of them work as far as tail lights and brake lights. I am stumped on this one.

Thanks in advance, Mike

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Old 01-02-2008, 02:44 AM
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Those pontiac tails are notorious for bad grounds because of how the inner pan and the outer bezel are pinched on the rear of the car with gaskets. I had to run a separate ground wire to a screw from the light pans in my 66 Bonny. Check continuity from the light pans to the frame or other good ground and see what you get.
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Old 01-02-2008, 06:58 AM
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GM 60s cars are plagued with bad grounds on rear lights.

Even if you get a good reading with an ohm meter while checking the ground to each rear light housing, that ground could "go away" if you put a load on it with one bulb trying to light up.

My 64 chevelle drove me nuts back in 1968
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Old 01-09-2008, 02:30 PM
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Thanks for the suggestions, it appears to be my turn signal switch. If I jiggle the handle, the light comes on. I will delve into this further and post what I find. Thanks again.

Mike
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