I'm having some wiring problems and was wondering if someone would be willing to email me the wiring diagram from the service-repair-manual for my truck ? Its a 1977 1 1/4 ton ex-military truck that was converted into a wrecker, now I want to use it for a plow truck. We just installed a trailer wiring harness along with a trailer brake. Now when the head lights are on I have no brake lights. Horn was re-wired to a external button, dash lights don't work, just need to sort it all out.

Is the M series light switch still in place and in use?

Its just a Glorified W200. The military just rated them different. It'll be the same as any 77 W-series truck

Well I was just stating you can use a Normal Powerwagon diagram. Most people think they are some special truck thus thinking they are different than a normal W200. We didn't screw up your wiring job so chill

The wiring diagrams are available on ramchargercentral.com in the pictures section.