When I bought my truck the wiring was a disaster. I put in a high-amp 1-wire alternator and replaced the wiring harness from scratch and life is good. The battery charges, the alternator does its job, the ammeter needle moves around. Room for expansion if I want to add more electrical goodies in the future. The new wiring harness is the way to go. I added a universal fusebox up inside the firewall, too.
