New tranny and now I have wiring issues?

[Jayred]

I need some help. I have a 71c10 with ls and now a thm350. I took out my 700r4 and just finished installing a thm350. Pretty simple swap, no wiring, no big changes except for moving the crossmember forward. I hooked everything back up exactly the way it was before-- said a prayer, started the truck, ran for 5 minutes to get the new fluids circulating and when I put it in gear the whole thing died. I would try to restart several times and it would begin firing as the starter was turning but once I stopped cranking it would immediately die. I tried that 3 times then out of nowhere smoke is coming out of the dash and I stop everything. I jumped under there and noticed two wires from the back of the ignition were shinny and hot like they were getting ready to melt. Nothing is rubbing on the headers, my grounds are all hooked back up, I have no clue what is happening here. I have never had any wiring issues ever. The only weird thing was the neutral safety switch was not letting me start it in park, I had to put it in neutral to get it to crank. The starter isn't the best, it's hard to start when the engine has warmed up.

So now every time I turn the key to acc the lights go super dark in the cab and those wires start to heat up again. I disconnected the battery and walked away for now. I don't want to keep fn'ing with it and cause more damage. Any thoughts on where to start. Wiring is my weakness