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Only drivers side brake light works

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Old Mar 10, 2021 | 01:04 AM
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Default Only drivers side brake light works

Thanks for taking the time to respond, Iam having some electrical gremlins that are getting the best of me. Besides courtesy lights having no power at fuse block, now I noticed that only the drivers side brake light works, I have checked the simple stuff, fuse is good, bulb is good, turn signal works, lights work when turned on, just no power when brakes are applied just to the pass side.
According to wire diagrams the brake wire appears to be the dark green, any ideas on where to chase this side of the circuit down to? This is over my head and would appreciate any ideas. Makes me scratch my head that all other tasks work in the socket just not the brakes.
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Old Mar 10, 2021 | 02:10 AM
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If turn signal and lights are working on the pass side, the ground seems to be OK (often a problem).
Since the lights are "daisy chained" did you check the connection between driver's and pass side lights?
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Old Mar 10, 2021 | 03:41 AM
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Try connecting a Temporary single ground wire to the bulb socket that is not lighting up. Also use a voltage meter to read 12 volts positive on the brass contacts inside the bulb Socket. Are the light bulb socket brass contacts clean and shinny (making a good electrical connection)? Try these tests before attempting to remove/disconnect wiring harness? Use a good light to inspect the wiring harness from under the car, look for taped areas or cuts, routinely found in work done by Bubba or his Cousins. Let us know what you find.
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Old Mar 10, 2021 | 03:48 AM
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It could even be internal to the socket itself. Check for both 12V at the socket, and continuity to ground.

This was in my 80. The ground wire connector had failed inside the socket.


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Old Mar 10, 2021 | 07:39 AM
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could be the bulb isnt installed correctly either. Bad connection....
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Old Mar 10, 2021 | 10:17 AM
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I am going to buy a new socket to see if that fixes the issue. I know I had to wiggle some wires just for the taillight to work.
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Old Mar 10, 2021 | 10:28 AM
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Have you tried jiggling the turn signal lever (in the off position) while stepping on the brake peddle?
(the brake light circuit go through the turn signal switch and sometimes those contacts get dirty / loose)
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Old Mar 10, 2021 | 12:48 PM
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no haven't tried that yet but will
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Old Mar 10, 2021 | 01:22 PM
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To test the socket attach a wire to a good ground and touch the other end to the brass. If the light goes on, you lost the ground inside the socket.



Also, check at 'N' on the harmonica connection for power with the brake pedal pushed.

Last edited by Peterbuilt; Mar 10, 2021 at 01:23 PM.
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Old Mar 10, 2021 | 02:17 PM
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Well my friends, as has been said its usually the simple stuff. After testing as suggested it was a bad socket, weird how they can be so finicky. I really thought I had a bad bubba wiring hob on my hands. After putting in new socket everything works fine now. Thanks for all the help.

Now I need help on why the interior lights stopped working. I have no power at the fuse at all, either side. They worked when I first started working on car now don't. Fuse is good.
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