SOLVED & updated: Any mechanical/electrical genius out there

JMHO. I would temporarily by pass the fuse with a jumper and fuse. If it solves the problem most likely the fuse contacts. If not, I would temporarily run a complete wire from ignition. I'm sure you realize if you took it to an electrical repair shop they would most likely just run a new wire from the switch to the solenoid with a new fuse in the line. I had a similar problem with my previous PU. Mice had chewed half way through some of the wires. Easier to replace bad wire than an entire cable.