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rear brake light trauma
Posted by: richard lane ()
Date: May 19, 2017 06:49AM

Hello,
All rear lights work except the brake lights.I've read all the threads and have eliminated most of the areas to check. I'm getting power to the switch ( where the plugs attach to the male end of the switch )but I'm not sure once the brake is applied if the circuit is complete to send the power back to the bulb. Thanks in advance for some input. Richard

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Re: rear brake light trauma
Posted by: cnicol ()
Date: May 19, 2017 06:53AM

Of course the output side of the switch should get 12v when the pedal is pushed down.

From there the wire goes to the turn signal switch. The switch sorts out whether the juice goes to both brake light bulbs (signal lever in middle) or only one brake bulb (signal lever to left or right turn).

What year and model are you working with? (I assume it's a Corvair)

Do the turn signals light in the rear when the signal is engaged?

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later

+17 Tons of parts

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Re: rear brake light trauma
Posted by: Chilly Willy ()
Date: May 19, 2017 06:53AM

To test switches, the ohm meter is your best friend.



Will
Northern California

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Re: rear brake light trauma
Posted by: Chilly Willy ()
Date: May 19, 2017 06:58AM

Also,Did you check the switch adjustment?



Will
Northern California

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Re: rear brake light trauma
Posted by: cnicol ()
Date: May 19, 2017 07:03AM

Chilly Willy Wrote:
-------------------------------------------------------
> Also,Did you check the switch adjustment?


Craig notes: Will's comment applies if you have an early model or an FC.

What year and model are you working on?

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later

+17 Tons of parts

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Re: rear brake light trauma
Posted by: richard lane ()
Date: May 19, 2017 07:07AM

Thanks folks!
Output side? Would that be the white wire? I've used the light checker thingy ( not sure the real name) and I found a good ground and the black wire lights up.

The corvair is a 66 corsa turbo coupe.

And yes, the turn signals work in the rear.

Switch adjustment? I'd better check that also..

Thanks all

Richard

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Re: rear brake light trauma
Posted by: Chilly Willy ()
Date: May 19, 2017 07:28AM

I double checked my '66 😉



Will
Northern California

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Re: rear brake light trauma
Posted by: cnicol ()
Date: May 19, 2017 07:43AM

richard lane Wrote:
-------------------------------------------------------
> Thanks folks!
> Output side? Would that be the white wire? I've
> used the light checker thingy ( not sure the real
> name) and I found a good ground and the black wire
> lights up.
Yes, the white wire is the output side of the switch. It shoud light your test light when you push the brake pedal
>
> The corvair is a 66 corsa turbo coupe.
Thank you for that. You'll get all kinds of red-herring responses that apply to other models if you don't say what you have.
>
> And yes, the turn signals work in the rear.
Great news! That narrows it down to the brake switch or the turn signal switch, or the white wire between them
>
> Switch adjustment? I'd better check that also..
There is no switch adjustment on a late model. This is an example of the kind of red herring you get when the responders don't know what you're working on.grinning smiley
>
> Thanks all
>
> Richard

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later

+17 Tons of parts

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Re: rear brake light trauma
Posted by: Chilly Willy ()
Date: May 19, 2017 08:18AM

I guess I have a red herring confused smiley
Maybe my LM is specialgrinning smiley



Will
Northern California



Edited 1 time(s). Last edit at 05/19/2017 08:24AM by Chilly Willy.

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Re: rear brake light trauma
Posted by: richard lane ()
Date: May 19, 2017 08:32AM

Thanks for the help..stay tuned. Richard

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Re: rear brake light trauma
Posted by: Chilly Willy ()
Date: May 19, 2017 08:45AM

Whoops! On second thought, adjustment would apply to lights that stay on.
Also,Look at the switch and press the pedal down. Look for the little knob to come out.



Will
Northern California



Edited 1 time(s). Last edit at 05/19/2017 08:49AM by Chilly Willy.

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Re: rear brake light trauma
Posted by: cnicol ()
Date: May 19, 2017 08:54AM

Chilly Willy Wrote:
-------------------------------------------------------
> I guess I have a red herring confused smiley
> Maybe my LM is specialgrinning smiley

Well... it is "red"!grinning smiley

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later

+17 Tons of parts

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Re: rear brake light trauma
Posted by: Chilly Willy ()
Date: May 19, 2017 12:38PM

cnicol Wrote:
-------------------------------------------------------
> Chilly Willy Wrote:
> --------------------------------------------------
> -----
> > I guess I have a red herring confused smiley
> > Maybe my LM is specialgrinning smiley
>
> Well... it is "red"!grinning smiley

That's funny right there!! grinning smiley



Will
Northern California

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Re: rear brake light trauma-the sequel
Posted by: richard lane ()
Date: May 22, 2017 07:02AM

Hello I'm back.

Here is a recap: The rear brake lights don't work
The rear headlights work
The rear turn signals work
The brake light switch is getting power(on the feed side)
I checked the switch with a ohm meter and it's OK
So..there you have it..on to the switch behind the horn?

Thanks, Richard

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Re: rear brake light trauma
Posted by: cnicol ()
Date: May 22, 2017 07:54AM

If you get power out of the brake switch when you push the brake pedal, AND the same white wire when checked at the turn signal connector shows power when the brake pedal is pressed AND your rear turn signals work...

Then

Your car needs a new turn signal switch. The switch is a bit difficult to access and exchange. If you are confident in your abilities, go for it. However if you are less than confident it would be best to find someone to change it or help you change it.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later

+17 Tons of parts

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Re: rear brake light trauma
Posted by: richard lane ()
Date: May 22, 2017 03:00PM

Craig, thanks for the info. you mentioned the turn signal connector..where is that again? I'm going to re-check this series again just to make sure. I can only try each test on the weekend because the car is not at my house. Richard

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Re: rear brake light trauma
Posted by: RKF ()
Date: May 22, 2017 06:24PM

I had a similar problem with my '66. I had juice at the input of the switch, but the brake lights would not work. The problem turned out to be a bad connection in the fuse block. The connection was strong enough to deliver 12V to the switch, but the connection would fail when I pressed on the brake pedal. It could not carry the load of the brake lights.

I ended up replacing the original fuse block with a modern one.

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Re: rear brake light trauma
Posted by: Ed Dowds ()
Date: May 22, 2017 06:28PM

The turn signal connector is on the outside of the column just below the edge of the dash. It is actually two plastic connectors. It is easy to see once you look under the dash.

Ed
Hillsborough, NJ
66 500 rear 4.3 V6 Corvair
69 350/350 TH Camaro was RS
30 Model A Ford Streetrod 350/400 TH
88 Celebrity Wagon (Daily Driver)

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Re: rear brake light trauma
Posted by: richard lane ()
Date: May 24, 2017 06:01AM

Thanks for the help folks! I will try again over the weekend. When I do drive, during the day I turn on the lights only when I stop. Works so far..

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