So far, i’ve...
1) Checked the Stator coils. Measured about half an ohm resistance between the two heavy yellow wires at the regulator.
2). With the Master ON ( Mag A & B OFF), measured battery voltage from ground to the thin Yellow wire (“C” terminal).
3) Checked battery wire continuity. With the Master still ON, measured from ground to each white wire (“B” and “R” terminals). Measured battery voltage at both.
4) Checked the regulator ground but I did not do so at load. Looks pretty good though with lots of contact area.
So....it’s indeed looking like a bad regulator. I just can’t believe it failed a six hours. I have a new one inbound and will install it to confirm. Also have ordered the S H kit from Van’s.
Now I’ll have to decide wether to keep the Ducati installed to finish the test program or just bit the bullet and install the H S kit now. (I’ll be crying as I cut into my flawlessly painted cowl.)
Btw, since I was in test and downloading data, I looked back and found the the charging amps went negative for a short time during the last flight and then failed hard during approach. I didn’t notice it until startup the next day.
Thanks everyone for your help.