Only one brake light working - Impala Tech
Electrical & Wiring Troubleshooting electrical problems

 
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post #1 of 8 (permalink) Old 08-03-2018, 04:14 PM Thread Starter
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Only one brake light working

Weird problem with only the passenger side brake light working, nothing on the left.
The indicators work as do the tail lights (when headlamps are on), just no brake light.
The bulbs are fine.

Any ideas?
Thanks
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post #2 of 8 (permalink) Old 08-03-2018, 04:21 PM
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Bad pig tail or socket with a bad ground would be my guess. Without seeing the parts and testing for voltage and resistance to a known good ground that is all I can do is guess.

Big Dave
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post #3 of 8 (permalink) Old 08-30-2018, 10:56 AM Thread Starter
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So I've checked how all the bulbs are seated and the sockets all seem to be grounded ok (surely the indicators wouldn't work either if they weren't?)

And now mysteriously the passenger side stopped and the drivers side works periodically when i push the indicator arm all the way up (turning right).
Could the issue lie in the steering column with the wiring harness; are these even connected somehow?

Thanks
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post #4 of 8 (permalink) Old 08-30-2018, 12:16 PM
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Since the brake lights and the turn signals use the same filament in the bulb the answer to the question is yes they are electrically connected. A broken turn signal is another possibility.

Big Dave
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post #5 of 8 (permalink) Old 08-30-2018, 02:26 PM Thread Starter
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Yeah, I meant related at the turn signal; I think that's the issue.
Now to get the damned steering wheel off!
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post #6 of 8 (permalink) Old 09-12-2018, 11:04 PM Thread Starter
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Success; sort of.

I got a replacement turn signal switch from Classic Industries (that comes with the wiring loom) installed and now I have brake lights again and good turn signals!

However, now the horn constantly goes! I've had to disconnect (at the horn) for now.
Any thoughts on why?
I followed the workshop manual closely and pretty sure I've got everything in correctly however I know it happens once the center part of the turn signal switch goes over the steering shaft.

So close, but still so far.......
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post #7 of 8 (permalink) Old 09-13-2018, 12:38 PM
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You horn power wire is grounding out.

Could be the wire that feeds power has caught under the turn signal as it went back together shorting the insulation, or a spring that is grounding the horn wire out.

Big Dave
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post #8 of 8 (permalink) Old 09-27-2018, 10:12 AM Thread Starter
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So, the diagnosis was spot on; the power wire had been pinched and was making contact.
I compared the path of the wire on the new switch to the old and they were different.
After taping up the cut I followed the path of the old wire and everything is now fully functioning.
To save others from this headache, attached is a photo of the horn power wire path from my old switch.
Thanks for all the help
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