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Old 10-22-2020, 10:43 AM   #4
LockDoc
The Older Generation


 
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Join Date: Aug 2006
Location: Montezuma, Iowa
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Re: What are these wires for ? 72 GMC

Quote:
Originally Posted by Canadian 72 C15 View Post
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.

Yes, for the temp gauge. Some of the later engines may have had a sender in the T-stat housing but I think the '72 was still in the drivers side head. Not sure about the Canadian models though.

There is a port by the #8 plug also but you very seldom see a temp sender in that location. Do you have a temp sender in the drivers side head by #1 plug?

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