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Getting into the rear harness. I laid out plywood big enough to fit the entire harness to use as a layout board. The harness was stretched out along the board and i did a rough layout using screws to boarder the wire. This helped keep the old wires in place while i was unwrapping them as well as...

I forgot to attach the light switch diagram. This is courtesy of Larry LaBahn on the M37 Facebook page.

Ill start off with, I have a 1952 M37 that I purchased on a whim 3 years ago. From the time I bought it the electrical system was in shambles. I had no working lights at all, and every wire was labeled differently than the schematic with painters' tape, and half-baked splices all over the place...

Right, if I’m not mistaken that was with the addition of turn signals that the internals were changed out for a 3 wire, with 3 bulbs, and the B/O stop light added outboard of the passenger tail light.

I have never seen a PDF of it yet in all the searching ive done. i did however get a copy off of either EBAY or Amazon for about 40$. Its worth the price when you start getting into rebuilding anything beyond the body.

Im just now seeing this as i havnt been active online in a good bit, you know how work and those projects around the house go. Anyway, i just rebuilt my whole trucks wiring harness from scratch over the winter. In the course of doing so I documented alot and made some edits to the schematics to...

There is only one wire. Here is a better picture. That may explain it then, since this was converted to a B1 at some point. (Found bondo over the mount holes for the side mounted spare) So say it was you rebuilding this harness 100%, go with a 5 wire or keep the single wire from the regulator.

Hello all. Have a few questions on the wiring. I’m am getting ready to pull my front harness and rebuild it, I’m doing so I’ve been going through and labeling everything since most of the metal tags are either gone or not readable. However the wiring to the voltmeter does not align with either...

After 2 days of fighting, head scratching, and a few beers, I managed to get all of the light wires tracked down, tagged, and the rear harness pulled from the truck. It was so brittle I had to pull the fuel tank to get it out without damaging it too much. Going to finish up on the headlights and...