The P.O owner of my car has done a few odds things as I'm discovering during the restoration. Heres the latest, any reason why they would splice this large red wire into the harness? I cut it but you can see in the pics where it spliced to the two main harnesses.
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These are from another thread here. Yellow has something to do with the starter solenoid. Maybe stealing power there.

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My guess is the PO installed an aftermarket switch for starting the car. It's common to have poor connections, high resistance in the ignition circuit and maybe adding a backup switch was their solution.

Not sure where they would add a switch? the red wire was spliced into the yellow wire which per Shivers diagram that goes to the starter relay and then ties into the main body harness, I guess i need to see what wire its tied to at that harness.