First startup attempt, Melted wire....Help!

I have another idea. I have been pouring over my wiring diagrams and it is not perfectly clear which wire should feed power to the interior. My new wiring harness has a large black wire with a forked connector, my old harness had a short jumper from the starter solenoid to the second large connector on the bulkhead. Is it possible that I got the 2 of these primary wires reversed? I have included a picture with the top part of my connector removed for clarity. The wire with the blue insulator is currently hooked up to the bulkhead stud closest to the fender, which was attached to the power stud on the starter solenoid.