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Old 03-01-2024, 05:37 PM   #1
1971Stepside
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Join Date: Mar 2002
Location: Springfield, MO
Posts: 2,930
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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