Headlight switch , is it the cause? or the curse?

under the hood the bulk Y - Z definitely looks melty. Most of the other wires all look fine, not chopped. I am not sure what caused the melty. I might hazard a guess that as the Dimmer switch fell apart, it caused a short which would cause melty at the dimmer connection and the bulkhead high beam connection.
I might try to bypass the bulkhead and try to run a long cable out and around just to test it out.

let the games begin