Anyone know what this wire is that I smoked?

Finally got the new shifter in and the freshly rebuilt trans filled with fluid.

Went to start and after cranking a couple times, I saw a bunch of smoke!

Pulled the key and ran around to see what happened.

One wire that comes from the resistor had totally roasted.

Here's a picture of the wire at the resistor connection:



It's the left-most wire. You can kind of see the toasty insulation.

I tracked it and it ended in a cut:



Now, I'm not sure when that wire was cut. It may have been something the PO had done at some point and I just never noticed. If that's the case, I'm guessing his hack-job shorted on the firewall. Maybe had something to do with the factory A/C before the PO removed it? (Not sure why a/c would need ignition power?)

It's also possible that it got cut somehow in the madness of removing and reinstalling the transmission. I don't think that's what happened. I was really careful to make sure nothing got pinched etc. but it's still possible. I can't find anything else cut that it would have been part of though.

So does anyone know where that wire is supposed to run?

Thanks in advance!

~Rev.