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Discussion Starter · #1 ·
The left rear brake light on my 1971 Mach seems to have a mind of its own right now. When I hit the brakes alone it does not light up, when I switch the hazards on it fails to work as well. Only when the right turn signal is being used it lights up. The tail light was working fine a couple weeks ago. I have checked all of the wiring and connections, even replaced the brake light switch to no avail. I am completely stumped. Please help. Thanks.
 
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Discussion Starter · #2 ·
Dou;ble check your grounds around the rear end. If that doesn't reveal anything, use a 12volt meter, and probe the contacts in the socket base, while someone puts the brake on. I had a boat trailer do that one time, and I ended up rewireing it because I couldn't find the problem. I think I finally decided that it was a short up inside the trailer.

http://members.tripod.com/tangdar/
'67 Coupe project car (Did I say project car? I meant pile of rust)
http://www.americainter.net/~fevans/tangdar_flintstone.jpg
 
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Discussion Starter · #4 ·
Had a similar problem once. It was the turn signal switch. If you've replaced it (or fooled w/ it) recently, there must be a mis-wire.
If nobody's touched it, there must be a break and/or short in the switch.
If it's not in the switch or column, break out the ol' wiring diagram and get to work.
Good Luck
 
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