Alternator Pulsing

The mechanical voltage limiter may or may not be the problem. In most cases there isn't a simple way to diagnose it other than locate the wire that supplies 12 volts to it a clip the wire. It's dark blue with a white tracer and routed in the harness tape out from mian harness to the round harness connector that attaches to the instrument panel.
Snip the wire, pulse condition goes away, found the problem. Replace the limiter repair the sniped wire, happy moparing. Good luck