Hemienvy, where in Washington might you be? I am fair at electrical issues. I live in 'Little Detroit of the West".

I just rewired my sons 1974 D200's under hood due to so many corroded connectors. On Ebay you can get new Bulkhead male and female connectors that lock in the bulkheads plastic.
His 10 gauge alternator feed to the Amp meter was bad and the return to the battery was totally melted and not charging the battery. His headlight wires were 18 gauge, not the 16 gauge as in the wiring diagram. They are now 14 gauge.