48 Chevy COE custom diesel build

[Purcell69]

The wiring is going to be time consuming either way. Your best bet would be to start with the whole harness being able to start and run the engine, and eliminate one wire at a time. This way you can ensue you don't delete a wire needed to start and run the truck. A friend found this out the hard way while converting an old Crown Vic to a race car. He started to lop off what he thought was unneeded wire harness, only to find out the car wouldn't start later. He had to back track and reconnect all the wires and start over.

As far as repurposing unused circuits from the harness for your own needs, yes that can be done so long as the devices done draw more power than the wire size can handle.

-Joe