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I am installing LED tail lights on my 69. The old housing and lenses do not have a gasket. I ordered a new gasket set and new lenses as the old ones were cracked. My questions is, do the gaskets go between the housing and lens or do they go between the lens and the body/tail panel?

Dumb question, but it seems either answer is correct and the gasket between the housing and lens would be a tight, tight fit. Thanks for the help.
 

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On my 67, there's a foam/rubber gasket between the lens and housing.

The tail light housings on the 67 has 4 raised metal points that make contact with the metal body when they are bolted in. I had issues of no tail lights, turn signals, or back up lights working at one point. It was due to the car having a new paint job, and these 4 raised contact points of the til light assemblies were not making a good clean contact to the metal body to obtain ground. I ended up adding a home made ground strap on each tail light assembly inside the trunk compartment, using one of the tail light threaded screws/bolt to solve the problem.

I'd think if a gasket was used between the tail light housings and body, it may prevent this required ground contact, unless GM did something else after the 67 models.

The AIM (assembly instruction manual) for 69 would indicate gasket requirements and location.
 

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Gasket goes between the panel and the lens, nothing between the lens and housing on a 69. The sockets have their own grounds so the plastic housing doesn't need to contact metal like the 67. The gasket keeps the water out of the trunk.

Jeff
 
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