Magnum Alternator Wiring
I use the stock Magnum Alt. However, I did unplug all of the bulk head connectors and cleaned both the main terminal and the connectors. And, checked each and every wire. Years (40+) on the wiring harness will show its age. If you have any brittle wires anywhere then they will be the ones to go up in flames.
You may consider a complete harness if there are many questionable wires. As stated above use fusible links.