I’ve recently come across a wiring problem on my car (68’ fairlane 500 with a carbureted 91’ mustang 302). I bought the car running and driving, however, the starter solenoid has began to become a problem as it keeps blowing. The solenoid has been replaced 3 times now (hoping it was just a faulty part) and is obviously not the problem. Seems like I’m getting constant power to the starter when the battery is hooked up as the car will try to turn over the second I put both leads on the battery. Trying to diagnose this issue, I had a puff of smoke rise from the engine at side of the firewall from what I hope was a corroded grounding wire. I am now debating my next move as I can go with a full universal painless wiring harness replacement or try to freshen all grounding connections and tediously track down any damaged wire/insolation and splice in new material. Not the most fun problem to have on my first project car. Has anyone had similar problems or replaced their harness? Any recommendations/expertise is greatly appreciated!