Thank you for the assistance.
We’re back to testing at 117-118.
Gratefully, it turned out to be a simple fix this time. As simple as the order in which things got plugged in to access shore power and being sure all draws were turned off beforehand.
Dogbone gets plugged in first. Instead of last.
1993 Gulf Stream Friendship LXE 37'
C8.3-250 Cummins diesel pusher
Looking for a 4-down toad