Alternator wiring issues
The field wires, and output wire were originally hooked up something like this.
Alternatively you could run the output wire like the '73 60 amp alternator cars were done. I've posted that here before so a search will turn that up.
The wires in your hand you'll have to look up in a '72 FSM and/or '72 Master Tech booklets at the Imperial Club or Mymopar.