When I did my '48 1.5ton with a JIm Carter cloth harness I removed the headlight switch and connected to it first, then I connected to each gauge and installed them one by one. Then I passed the harness thru the firewall and connected to the fuse box, headlight connectors, and engine bay. I laid the new harness out beside the truck and studied it for a while before installing it. I printed a colored wiring diagram to refer to, instead of dragging the manual around with me.
Good luck, Curt
