73-87 wiring diagrams

[1977cheyenne_C10]

Originally Posted by hatzie

There will be some differences as GM improved and just plain changed things. 73-75 has an ammeter in the dash. 76 had voltmeter and mechanical oil pressure gauge, 77-91 has electric oil pressure and voltmeter, 73-82 had floor mounted dimmer and 83-91 on the column... Other systems remained pretty close over the entire 73-91 run.

It's best to get the diagram for your year. They're reasonably small files so download and look a few of them over. 81 & 82 truncated diagrams are in the service manuals combined with the 80 & 83 full diagrams you'll be able to muddle through... '84 the is same way '83 & '85 diagrams should get you close enough to fix the problem.

I'd love to get a couple quality hours with my laptop, sheetfeed scanner, staple remover, and the fullsize GM light truck 81, 82, & 84 diagrams. If anyone in New England, San Francisco Bay area, or the Salt Lake valley has a set I'd like to talk about a short loan. The wiring manuals are stapled so they can be disassembled and re-assembled given the proper care.

thanks for the info. one quick question how about between a Chevy and GMC is it still the same? just difference name? i have a 1977 Gmc pick up.

[Riley012]

I am changing cabs from a 1985 chev k10 to a 1982 k20, is there anything that should concern me. I know the wiper switch and maybe the cruise control are different. Hopefully the plugs will be the same.

[dealrcn]

Does anyone have the diagram for a 1986 c10 instrument cluster without gauges? Trying to figure out what wire number on the cluster connection equals what.

[hatzie]

Originally Posted by dealrcn

Does anyone have the diagram for a 1986 c10 instrument cluster without gauges? Trying to figure out what wire number on the cluster connection equals what.

The Electrical FAQ has cheatsheets with this exact information. http://67-72chevytrucks.com/vboard/s...51&postcount=2
The 1986 GM wiring diagrams in my signature will as well.