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One brake light does not work - Turn signal is the cause
Posted by: aircooled ()
Date: October 21, 2013 08:46AM

This is not really a question, more of a solution that some would like to know in case they run into it.

The problem was, one brake light not working, all other lights work and the bulb / ground are good.

Traced the problem / wire back to the turn signal in the steering wheel (power goes in, does not come out). I did not realize the brake lights went through the turn signals! Replacing the turn signal fixed the issue. I could have been the connection to the signal (that will be tested later) but there was an extra (new) signal assembly laying around.

Other things learned: There is no wiring information for the turn signal that I could find. That is a bit strange and makes it a bit harder to diagnose issues. Anyone know if that is in the manual at all, I could not find it. Also, the manual does not note the c-clip that holds the turn signal assembly in, that's bad.

It looks like the brake light power is routed from the brake switch through the turn signal (to allow interruption by the turn signal) while the turn signal is grounded by the turn signal, so the only power going into the turn signal is the brake light power.

Tim
Southern California - Where the stars are on the ground and dirt is in the sky

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Re: One brake light does not work - Turn signal is the cause
Posted by: aircooled ()
Date: October 21, 2013 09:22AM

Found a diagram with a quick search that seems close (this is Ford, so obviously not the same):



It does show how it disconnects the brake light when the turn signal is on.

Tim
Southern California - Where the stars are on the ground and dirt is in the sky

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Re: One brake light does not work - Turn signal is the cause
Posted by: azdave ()
Date: October 21, 2013 09:47AM

Here is a visual of the LM switch inside the column. As you can see, insufficient pressure at either contact touching the terminal marked "B+" could result in one or both rear brake lights not working on either side even though the turn signals might work fine.



Dave W. / Gilbert Arizona
65 Corsa 140/4
66 Corsa 140/4
66 Corsa 140/4 w/factory A/C
66 Corsa 455 Toro V8
65 Monza Convertible 110/4
66 Monza Convertible 140/4 A/C
65 Monza 4DR 140/PG w/factory A/C
65 Monza 4DR EJ20T/5



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Re: One brake light does not work - Turn signal is the cause
Posted by: acardon ()
Date: October 21, 2013 09:48AM

Here is an actual picture of a late model switch.



The Trunk Belongs in Front, Ask Any Elephant
Caution: Images in This Mirror May be Waterpumpers
Don
NTCA....DFW,TEXAS
66 Monza 1 owner

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Re: One brake light does not work - Turn signal is the cause
Posted by: aircooled ()
Date: October 21, 2013 10:43AM

OK, thanks.

I though I had seen something like that here before.

Still strange that it is not represented in the wiring diagram.

Tim
Southern California - Where the stars are on the ground and dirt is in the sky

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