I just picked up a former fire dept truck. The wiring has been chopped on a little to add all the stuff on for the lights, radios, etc. I am trying to figure out what is original and what isn't and repair what's there and get rid of what I don't need. Specifically I'm trying to identify a factory wire that is green with a white tracer on the back of the fuse box.

Does anyone have a clue what this is or better yet have a diagram?

 

Anyone????

 

Helm (helminc.com) has printed all of FoMoCo's service literature since the late 1940's. Nothing wiring related is available for 1974/75.

Helm has the 1976 Medium Duty truck wiring diagram available: #365198T76 ($15.00) / Another for 1976 B500/750 School Busses: #365198U76 ($15.00).

Only other source I'm aware of: faxonautolit.com (store located in Reverside CA). Faxon will also have Helm related lit, but will be used or maybe reprinted.