Smoked some wires today

A1B goes to the fusible link and then inside to the main splice etc..
S5 (12 ga brown) goes to the starter solenoid.
The only place they could be touching is in the engine compartment where they run next to each other along the fender.
But what happened, happened with the key was in Start. So this doesn't make sense - at least not yet to me.
Yeah they don't even come close to each other in the engine bay. The connector for the A1B is super hashed though. Pretty melted and I can tell its been spliced in. Don't even see the fusible link. Just looks like wire. Fire is getting pretty close so Ill have to check it out later.