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Old Dec 5, 2010 | 03:28 PM
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Default Unknown electrical part

On my 72, attached to the side of the dash top pad reinforcement, is a metal cylindar part that has a plug with pink and green wires connected to it. I can't find it in the AIM. Anybody know what it is?


Last edited by sassc3; Dec 5, 2010 at 03:55 PM. Reason: pic might help
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Old Dec 5, 2010 | 03:56 PM
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I don't see it the 72 wiring diagram either. Nothing I found has a pink/green combination except the backup light switch and that's in the console (auto) or on the trans (manual).

I recall something about a wiper thing that was on the back of the speedo in some years but no idea what color the wires are.

Last edited by TimAT; Dec 5, 2010 at 04:36 PM. Reason: Someday, I'll learn to type and spell!!
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Old Dec 5, 2010 | 04:08 PM
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Originally Posted by TimAT
I don't see it the 72 wiring diagram either. Nothing I found has a pink/green combination except the backup light switch and that's in the console (auto) or on the trans (manual).

I recall something about a wiper thing that was on the back of the speedo in some years but no idea what coler the wires are.
I think you mean on the back of the tach. I have it, so it's not that.

Thanks for trying.
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Old Dec 5, 2010 | 04:23 PM
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Didn't 72s have a light that flashed for a short time and then went out ? I was thinking it might be that.

edit-sassC3 , I think I found it on a diagram , I PMd you a link to it.

Last edited by ...Roger...; Dec 5, 2010 at 05:03 PM.
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Old Dec 5, 2010 | 07:29 PM
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Not looking like anything stock, where do the two wires go. Have you traced them back to anything.
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Old Dec 5, 2010 | 07:40 PM
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Pink and Pink/black should be a switched hot....like your dizzy....

trick is, what that green wire goes to.....

and I have a '72 vert which WAS stock as a stove and absolutely NO recollection of that device on my car...not even a hole/hole set to mount it there....

lemme know, please, if I miss the solution....

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Old Dec 5, 2010 | 09:18 PM
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No idea abut the lights and what they are supposed to do. No interior lights have worked since i got it.

Roger, you must be right. With the info you gave me, I went and followed the pink to a lamp. At least I know the two go together. Thank you very much!

And yes, it looks stock. I removed all the black tape type stuff the harness was wrapped in. Looks stock to me.
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Old Dec 5, 2010 | 09:22 PM
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My early 72 has that in there also. The 72s did have a light that went on only for about 20 second. It illuminated the seat belts light in the console gauges if I remember correctly. This may be for that.
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Old Dec 5, 2010 | 10:16 PM
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Originally Posted by Gordonm
My early 72 has that in there also. The 72s did have a light that went on only for about 20 second. It illuminated the seat belts light in the console gauges if I remember correctly. This may be for that.


That is what it is. A time delay relay that turned on the "Seat Belt" warning light for a few seconds when the ignition was turned on; this would happen if the seat belts were fastened or not.
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Old Dec 5, 2010 | 10:19 PM
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Could be part of the circuit for the seatbelt warning buzzer and light in the center dash console. I have a '72 vert and when the ignition is turned on and the seatbelt is not connected, the red light in the center console lights and there's a warning buzzer with that, too. It'll buzz forever, not 20 seconds. The only way to shut it up is to connect the seatbelt or pull up one click on the hand brake. That stops the buzzer and puts the light out. Can't do much checking for you now, as the Vette is covered and buttoned up in the back of the garage for the winter. Sorry 'bout that!
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Old Dec 6, 2010 | 12:53 AM
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The pink and green on my 68 is the back-up lights, they sure changed things in a few years.
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Old Dec 6, 2010 | 11:37 AM
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my 72 harness has two sets of pink and green. one with the b/u light connector and the other with something different. both are electrically the same.
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Old Dec 6, 2010 | 04:41 PM
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I agree with all those who stated that it is the thermal delay for the seatbelt warning system.

That system is unique to only early 72's. Very early 72's had this simple system where the seatbelt warning light was illuminated for a brief period of time, and turned off automatically.

Later 72's had a more complex system that included switches in the seatbelt recievers, a pressure switch under the passenger seat, a tie in to the nuetral safty so that system was only activated in foward gear, and a buzzer to go along with the light.
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Old Dec 6, 2010 | 05:09 PM
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Originally Posted by Mashman
I agree with all those who stated that it is the thermal delay for the seatbelt warning system.

That system is unique to only early 72's. Very early 72's had this simple system where the seatbelt warning light was illuminated for a brief period of time, and turned off automatically.

Later 72's had a more complex system that included switches in the seatbelt recievers, a pressure switch under the passenger seat, a tie in to the nuetral safty so that system was only activated in foward gear, and a buzzer to go along with the light.
Interesting, I learned something today ! Did the thermal delay just turn the light off or did it flash a couple times first ?
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Old Dec 6, 2010 | 05:11 PM
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My 72 is an early built, August 71 car. The wiring harness actually has 71 on it. There is no signs of any connecters for the seat belts.

The light would just come on and stay on for 20 seconds then go off.
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Old Dec 6, 2010 | 05:18 PM
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Is this unknown part the part that looks like a starter buss for a florescent light ?
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Old Dec 6, 2010 | 05:21 PM
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Originally Posted by ...Roger...
Is this unknown part the part that looks like a starter buss for a florescent light ?
Yes
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Old Dec 6, 2010 | 05:23 PM
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That is what I thought it looked like also. Did '72's come with a black light? mike...
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Old Dec 6, 2010 | 05:50 PM
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Originally Posted by Gordonm
Yes
Interesting , I buy old harness's at swap meets to use for parts and I would have sworn the harness was a 73 but it had one of these thermal delay things. Must have been a 72 harness ! Thanks.
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Old Dec 6, 2010 | 06:53 PM
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Originally Posted by Gordonm
My 72 is an early built, August 71 car. The wiring harness actually has 71 on it. There is no signs of any connecters for the seat belts.

The light would just come on and stay on for 20 seconds then go off.
My 72 is also an early car, #456 built in August 71. When I was restoring my car, I tried with no luck to find a replacement for that part. I ended up using an industrial 12v time delay relay to make it work. It's the big orange thing in the pic.




Last edited by 7t2vette; Dec 6, 2010 at 06:56 PM.
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