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Joined: Jun 2001
Posts: 239
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I have good brake lights OR good turn signals, not both at the time. When I use both, I only have turn signals. Has anyone seen this? Not sure where to start. A nice sheriff in Rankin TX, was kind enough to point this out.  Tom
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Joined: Jan 2009
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So when your foot is on the brake and the signal is on, the direction you have activated flashes and the other side is out?
Do the front park/signals work properly. I've seen wrong type bulbs create all kinds of havoc.
Weird at best!
-Jeff
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Joined: Jun 2001
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Correct. The direction I have activated flashes and the brake lights go dark. Fronts work fine. I recently replaced all the bulbs and checked the individual systems, but never thought about checking them in combination.
Tom
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Joined: Nov 2006
Posts: 639
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I beleive your lights are working correctly. your turn signal
over rides your brake signal. The light bulb has two
filaments the top one is shared between turn signal and
brake signal, and the bottom one is your running lights.
to much of everything is just enough  
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Joined: Jun 2001
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Correct, but I lose brake lights on both sides, not just the one w/ the active turn signal.
Tom
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Joined: Jan 2009
Posts: 3,049 Likes: 10
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What about with the headlamps on?
-Jeff
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Joined: Jul 2003
Posts: 4,248 Likes: 14
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I think that might be a problem with the relay in the steering column.
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Joined: Nov 2006
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first check the connection of the plugs at the bottom of
steering column, then work your way to the turn signal
switch. I'll bet it's in the switch.
to much of everything is just enough
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Joined: Nov 2003
Posts: 6,158 Likes: 51
Administrator
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Administrator
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When that happened to mine it was the turn signal switch in the column that was bad.
Jim
'68 400HO Conv.
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Joined: Apr 2007
Posts: 2,770
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I had the exact same issue! First check your grounding on he rear light sockets. Then pop the steering wheel and clean the contacts.
posted some pics here:
https://firstgenfirebird.org/forums/ubbthreads.php/ubb/showflat/Number/109024/Searchpage/1/Main/10900/Words/%22TURN+SIGNAL+SWITCH%22/Search/true/Re_turn_signal_switch_washer_p.html#Post109024
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Joined: Apr 2007
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Joined: Apr 2007
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D@MN that WAS a nice amount of posts I just had, now it's all pear-shaped, LOL. 
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Joined: Nov 2004
Posts: 3,114
Senior Member
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Senior Member
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I too had a similar issue when I finally put mine all back together again. The culprit was a bad steering column turn signal switch.
68' Firebird 400 convertible, numbers matching, solar red w/ deluxe parchment interior. 66' Pontiac Ventura Hardtop 66' Pontiac Catalina Convertible
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Joined: Dec 2003
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My money is on Wouter. I'm laying five bucks on a bad ground.
- Jake
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Joined: Jun 2001
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If it's a grounding issue, I'm going to feel like a real jack[censored] for replacing the switch, because that didn't fix it. I cleaned up the sockets and housings a couple of years ago, so I dismissed the ground factor. Also the lights all work independantly. OK back to the basics. Cleaning all grounding surfaces next...
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Joined: Sep 2001
Posts: 2,902
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I quit wasting my time; after all, would have it made a difference if I said it was most likely a ground issue?
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Joined: Jun 2001
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The only difference would be you get to say "I told you so"
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