Need some electrical help with my ‘68 Plymouth Valiant 100

I ended up still getting the original FSM for 19 bucks on eBay.
Good for you! I do the same. I hawk ebay for old books, manuals and NOS engine and electrical parts, because nothing is made in USA anymore and the quality is questionable at best. With parts, I look for brands like Echlin (NAPA), Michigan, Sealed Power, TRW, Pacific, Hastings and on and on. The box has to be old and yellowed and say "MADE IN USA" before I pull the trigger. lol