1974 GMC Mason electrical

[Hew Klaus]

Hello everyone. I purchased a 1974 GMC Mason last year. Very simple design. 350 4bbl 4 speed manual. Using it for a small business I am trying to start. Stepson is the labor part of the business and mainly drives it. While driving it around some wires on the left side of the firewall were damaged. I have a strong electrical background but without a wiring diagram I can't do much to reconnect them. Can anyone give me direction for sourcing a wiring diagram?

 

[ali_c20]

Welcome from Austria.

Here is a link to jpgs:

http://forum.73-87chevytrucks.com/smforum/index.php?topic=11766.0

Or you can buy wiring diagrams online.

https://www.ebay.ie/itm/168282434886

 

[Shorty81]

Welcome fellow Buckeye.

 

[Mr Clean]

 

[Sad Sack]

Wiring diagrams here:

The SquareBody Reference Library

Part #s, RPO Codes, TSB's, Cast #'s, etc

www.gmsquarebody.com

 

[Sad Sack]

Also, really nice, affordable and color coded:

ClassicCarWiring.Com Home of the original color laminated diagrams

color wiring diagram, full color wiring diagram, vintage car wiring, antique car wiring, colored wiring diagram, wire color, Classic Car Wiring Schematics, Schematics for Classic Cars and Trucks, Car Restoration, Car Restoring, AMC Wiring Diagrams, American Motors Wiring Diagrams, Buick Wiring...

classiccarwiring.com

 

[WFO]

Welcome from the Texas Panhandle.

 

[86 C10 Shortbed]

Welcome from Reynoldsburg, OH