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Re: 1990 c3500 coolant temperature sensor wiring question
After looking at a few different schematics, it looks to me like the Square body trucks used terminal A11 for the coolant sensor ground, and the GMT400 used terminal D2.
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For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If it is modified from what came stock from the factory, let us know that too.
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