Rewiring an early A-body

I unplug my bulkhead and spray with WD-40, then blow it out, I let it sit an hour and reconnect annually. (Disconnect Battery 1st) It's the Fusible feed wire that you should remove and run separately through the firewall with a grommet. That's the one that heats up and melts commonly. JMO

Read some of this post. Good info.
MAD ELECTRICAL?