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03-01-2024, 05:37 PM
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#1 |
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Almost Satisfied
 
Join Date: Mar 2002
Location: Springfield, MO
Posts: 2,932
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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.
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1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far." |
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03-03-2024, 12:17 PM
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#2 |
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Senior Member
 Join Date: Mar 2003
Location: Colfax-California
Posts: 8,641
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Re: 85 GMC C25 Questions
AIR pumps had no wiring to speak of
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03-05-2024, 03:17 PM
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#3 |
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Active Member
Join Date: Jan 2017
Location: Traverse City, MI
Posts: 195
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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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