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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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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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Sounds like your turn signal switch is not working right.
Since that is the component you move to make it work
it makes since that the problem is in the switch. All of the
power for your brake lights goes through the turn switch
first.
 
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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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