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That was the immediate thought, but there really wasn't anything in the system that was touched. Most of the work was in the engine area but didn't include any wiring or alternator work.

Continued trouble shooting today. Bill at B&C suggested a probable cause of bad field connectors at the alternator. Swapped connectors and all seems fine. Field pin at alternator to ground is 3.5 ...

Thanks Joe, I'll run that test when I'm back out at the airport.

I've done some of that troubleshooting. With the Battery / ALT ON at 12.21V, I actually get 12.20 at the OV sense terminal and 10.52V out of terminal #4 which is the field line. Bus voltage into the r ...

Yes, only when the engine is running. It does not trip with battery, and it didn't trip with a power supply attached to the B-lead with engine shut-down.

I've actually tried both ways, and both pop the breaker. The contacts on the LR-3 look good, and all the grounds are good. I did pull the regulator if B&C wanted me to sent it in.

If not, I ma ...