Hi Brandon;
An erratic off/on behavior sure points to a break down or open of a wire in the alternator control circuit.
It could be a loose wire, or a breakdown of the field wire between the regulator and the alternator.
If that wire is old, it isn’t too hard to fabricate a new one and change it. I have heard of a situation where there’s a break in the field wire insulation and under certain vibrations/maneuvers the field wire comes in contact with the shield on the wire, which takes the field control voltage to ground, shutting off the alternator.
A dancing ammeter is usually linked to corrosion in the alternator switch. You check across the alternator switch should detect any voltage drop across the switch.
Let me know if I can help further, and what you find.
Steve
