He uses a multi meter on the plug endwith battery disconnected.Checked continuity from one spade to another.Found a bad diode.
He went to motorcycle school and is also a serve tech manager at a car delership
Also owns a few bikes and put a GS1100 motor in a road king frame. Cool Bike. No triumphs.
should have rectifier monday or tuesday. Am mounting it on lower front of bike on 2 tubes that go accross. Better Cooling.

I was so much older then, I am younger than that now (Wrote By Dylan Sung by the BYRDS,)