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Old 02-06-2023, 12:00 PM   #3
7beast
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Re: 1990 c3500 coolant temperature sensor wiring question

Quote:
Originally Posted by ChevyTech View Post
Yellow & Black.

Yellow is the Signal.

Black grounds through the ECM.
Thanks a bunch for your help sir! So the yellow signal wire will go directly to the ecm at pin C10 according to the ecm schematic correct? And what about the black wire does that go directly to the ecm aswell?
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