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1971Stepside

03-01-2024 05:37 PM

85 GMC C25 Questions

Anyone have the engine wiring diagram for the 2500 w/350? I've found some cut wires that I assume go to the former A.I.R. pump, but would like to know for sure. Additionally, I need to know where two wires in the engine harness route to. One is a blue wire (think it goes to the carb) the other is a pink/black that comes out of harness with the blue wire.

kwmech

03-03-2024 12:17 PM

Re: 85 GMC C25 Questions

AIR pumps had no wiring to speak of

THI	03-05-2024 03:17 PM

Re: 85 GMC C25 Questions

I do not have the diagram to either one, but keep in mind there were a Light-Duty version (7200 GVW) and a Heavy-Duty version (8600GVW). A lot more wiring on the LD version.

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