Adding composite lights

[Gordon Maney]

For those who have replaced their M37 lights with the later, composite lights, and wanting to retain as much original wiring as possible, how did you do that? Or is the wiring sufficient to simply connect them?

I don't have the new harness installed, and the lights are just on the shelf, but pondering what I might have to gather to accomplish this task.

[Matthew Ziegler]

composite

the front lights will simply bolt on, had to redrill the rear brackets and make up a short harness in order to have two brake lights, I'm not sure but the m37b1 harness may already be set up for two brake lights, I'm told it has factory turn signals as well

[carter davidson]

I added composite lights to a M37 I owned years ago and if I remember correctly you should have no problems. If you have a new B1 harness the wires should connect. At the rear of the truck however where the wires exit the new composite lights the mounting bolt holes locate the lights upward toward the cargo bed's underside and the wires will hit the orig. mounting bracket and you might have to modify the bracket to allow them to pass through or below it.

[Charles Talbert]

For those who have replaced their M37 lights with the later, composite lights, and wanting to retain as much original wiring as possible, how did you do that? Or is the wiring sufficient to simply connect them?

I don't have the new harness installed, and the lights are just on the shelf, but pondering what I might have to gather to accomplish this task.

The front lights have to be spaced forward on original brackets so they don't hit the fender and so the wiring isn't cut by being crimped at the bracket.

Rear lights must have a bracket modification to lower them downward and outward to keep the top from hitting the bed and the inward (center) side from hitting the bolt head that holds the bumperette onto the frame rail. Very simple mod, you will see immediately what I'm talking about when you get into the project, is a simple fix. New lights have packard connectors instead of douglas, easiest way to convert is to change original harness connectors over to the packard type. Late style harness will be correct except for the black-out stop light, which will be only on the right side as original. Simply splice in and run a wire across to the left light for the black-out brake light on the left side, that's it.

[Gordon Maney]

Thanks to all for posting!