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Sorry I can't help Bill :( I would have done the same as you and start with the ground, then maybe taken a closer look at where the bulb mounts/ makes contact with the socket. Hopefully someone will see this with an answer. If you don't get much replys here, maybe you can try the C1/C2 section with the older cars.
My 69 had a resident mouse which chewed through the wires under the carpet on drivers side rear compartment. may be worth pulling up carpet and checking it out since thats where all the wires go through to the rear of car. :smash:
:confused:
I wouldn't think a bad ground or poor contacts would cause a bulb to burn out. How many bulbs have you blown now? Is it just one of the filaments, or both of them?? Are you sure that you are inserting the bulb into the socket the correct way? I had a couple of bulbs burn out in my passenger side taillight last year and I finally figured out that the socket had worn enough over the years that it was possible to install the bulb backwards (1157 bulb is only supposed to install one way) without knowing it. I think (call this a bubba theory) what was happening was that since the bulb was installed backwards one of the bulbs contacts was touching both of the contacts in the socket, so whenever I turned on the right turn signal with the lights on and hit the brake at the same time it would blow that filament out in the bulb.
Just a thought.
Along the line Kevin was following (which BTW was a problem I had with one of my new bubble light sockets), has the wirings changed any? Is there any chance the parking and stop light wires have been reversed somewhere?
Bulb (dielectric?) grease was recommended to me by the group a while back when I was having tail light problems and I think it's a good idea to use it. I think it's intended to prevent corrosion, but I don't think that's going to solve your problem (but then again ?).
Anyway, I was thinking you also might want to check out the turn signal relay and see if you have a heavy duty one versus normal. I think the way it works is, the HD ones let a little more juice through for extra lights (like bubble lights or trailer lights).
I feel for you with this problem, I'm still fighting my tail lights too. Good Luck.
Bulb grease: I agree with jerryp58, use dielectric grease on all exterior bulb connections. Useage will help prevent rust/corrision problems, this is the same grease you use on inside of spark plug boots, coil boots, and to insulate and seal HEI coil round rubber seal and the electronic ignition module inside the HEI distributor.
Bill, let us know if you get this corrected. See my thread today on 76 brake light not working correctly. I'm still trying to figure this out!!!
Good luck!