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New to me c3. What does this switch do

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Old Nov 18, 2023 | 11:08 AM
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Default New to me c3. What does this switch do
What is this switch for?
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Nov 18, 2023, 11:52 AM
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That is the rear window defogger switch:

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Old Nov 18, 2023 | 11:40 AM
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arh

Don't know switch style seems more modern than C3.

Remove panel and start tracing wires I guess.

Sorry no help.

Mapman
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Old Nov 18, 2023 | 11:50 AM
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Doesn't look stock. Some ideas...hood light, ignition defeat, burglar alarm, power amp. Check what else is on the car that is not factory for a clue?

Edit Update: Yep...the Corvette Black Book shows a "C50" Rear Window Defroster option!
Last edited by Redvette2; Nov 19, 2023 at 12:58 PM. Reason: Learned something new...
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Old Nov 18, 2023 | 11:52 AM
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That is the rear window defogger switch:

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Old Nov 18, 2023 | 01:23 PM
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Originally Posted by Peterbuilt
That is the rear window defogger switch:
You didn't say what year but this is for a '74-'75 with a blower.
When GM changed to an element style defogger in '76 the switch changed to a two pin....just on or off.
'76 also had a one year only switch with a red indicator light...
Last edited by SEVNT6; Nov 18, 2023 at 03:09 PM.
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Old Nov 18, 2023 | 04:07 PM
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Looks like an add on customized switch. Not factory to whatever year this C-3 Corvette is.
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Old Nov 18, 2023 | 07:13 PM
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Originally Posted by LS WON
Looks like an add on customized switch. Not factory to whatever year this C-3 Corvette is.
Nope....that's factory. Believe it or not.
The switch in Peterbuilt's diagram is mounted in the left front trim piece of the forward console.

Just like in the pic......

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Old Nov 18, 2023 | 07:35 PM
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Originally Posted by SEVNT6
Nope....that's factory. Believe it or not.
The switch in Peterbuilt's diagram is mounted in the left front trim piece of the forward console.

Just like in the pic......
What year was that? 1976?
I am more 1968 to 1972.
Last edited by LS WON; Nov 18, 2023 at 07:36 PM. Reason: update
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Old Nov 18, 2023 | 07:49 PM
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Originally Posted by LS WON
What year was that? 1976?
I am more 1968 to 1972.
'68 to '73 had a round ****. It changed to a toggle switch in '74.
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Old Nov 18, 2023 | 07:57 PM
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1968-72 had the C50 option with the switch in the same place. The early cars just used a rotating switch instead of a toggle switch.
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Old Nov 18, 2023 | 08:13 PM
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The car is a 1975 4speed. All original except for side pipes.
it does not have a defroster element on the glass, are you saying there is defroster blower?
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Old Nov 18, 2023 | 08:34 PM
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Originally Posted by arh
The car is a 1975 4speed. All original except for side pipes.
it does not have a defroster element on the glass, are you saying there is defroster blower?
Yes! Under the driver's side rear carpet you will find the blower motor.
#5 is at the top of the rear quarter panel.


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Old Nov 18, 2023 | 09:18 PM
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My 75 has one also.
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Old Nov 18, 2023 | 09:49 PM
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Yes, it is the blower motor switch on a 1975.
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Old Nov 18, 2023 | 10:06 PM
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Originally Posted by kllgm2
Yes, it is the blower motor switch on a 1975.
A switch for the supercharger
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Old Nov 18, 2023 | 10:11 PM
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How about a convertible with the defroster? Got one in mine. LOL

https://www.corvetteforum.com/forums...nvertible.html

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Old Nov 18, 2023 | 10:12 PM
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Thanks for the help
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Old Nov 22, 2023 | 04:39 PM
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my 1975 4-spd car has same switch same location. But you already have your answer.
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Old Nov 29, 2023 | 03:41 AM
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Here's the blower and the grille...75 Convertible!



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