Magnum wiring help
I just used the pinout for the plug(s) and kept what I need to make the motor run and removed anything I didn't. Pretty easy to figure out, if you do it one pin at a time. Sometimes it took looking at the circuit to figure out if I needed it, but wasn't too bad.
And I have found several FSM online and for the ones I couldn't I paid a 6 month fee to AllDataDIY and printed everything I thought I would need after the subscription runs out. It was only like $15 or so and while it doesn't lay it out like the FSM, the diagrams are taken from it so it gave me everything I needed.
Make sure you have a pinout for your year PCM, too. I started hacking my '98 harness for an '01 PCM and discovered that some of the pins moved around and there were changes to how it controls things like the fuel pump relay and ASD relay. Wouldn't recommend a bastardized setup like I have, but even with a matching harness and PCM, make sure you have pinouts that match. This would be why I wouldn't want to come up with a diagram for someone, they changed some much year to year that it would be an exercise in frustration.