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**hatzie** · 03-27-2024, 08:11 PM

Really not a lot to an engine harness on 1986 and prior. I'd just roll my own or fully replace the one or two damaged wires.
Break the engine compartment down into sub-sections.

Forward lighting & horn is separate.
Wiper/washer wiring too.

I call the alternator, and starter separate as well. Look at the 1986 wiring diagrams for the starter and alternator wiring. It varies almost every year.

HEI power, temp sensor, oil pressure sensor, oil pressure switch & choke, and AC compressor.

If you have a feedback carburetor and ESC distributor there are only a few wires between em that run back to the ESC ECM and those are separate from the rest of the engine wiring. The knock sensor wiring is shielded so don't mess with it if it's not damaged.

03-27-2024, 08:11 PM	#5
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,916	Re: Engine wiring harness Really not a lot to an engine harness on 1986 and prior. I'd just roll my own or fully replace the one or two damaged wires. Break the engine compartment down into sub-sections. Forward lighting & horn is separate. Wiper/washer wiring too. I call the alternator, and starter separate as well. Look at the 1986 wiring diagrams for the starter and alternator wiring. It varies almost every year. HEI power, temp sensor, oil pressure sensor, oil pressure switch & choke, and AC compressor. If you have a feedback carburetor and ESC distributor there are only a few wires between em that run back to the ESC ECM and those are separate from the rest of the engine wiring. The knock sensor wiring is shielded so don't mess with it if it's not damaged. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful. Last edited by hatzie; 03-27-2024 at 08:20 PM.