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Old 10-22-2020, 10:32 AM   #3
Canadian 72 C15
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Join Date: Oct 2020
Location: Hamilton Ontario
Posts: 39
Re: What are these wires for ? 72 GMC

Quote:
Originally Posted by LockDoc View Post
The Green one would be for the temp gauge sender (should be in the head by #1 spark plug)

The other ones look like Alternator wiring.

LockDoc
Thanks for the response. I don’t know that the green one is long enough to reach over to the other side of the block by #1. I could try I guess. This would be the wire then I assume that goes to my temp gage in the dash ? Or at least did originally? I have a green wire on my thermostat housing now but again I don’t know if it’s hooked up anywhere else or it even does something.

As for the other plugs the red and the 3 wire plug yes a previous alternator connection sounds right.
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