So, I think I may have a Baaad BIRD! Checked voltage readings at house and chassis batteries, with ignition off and shore power disconnected, with 12.90 and 12.75 volts respectively. Above 13.1 volts seems to be the threshold for energizing the Trombetta relay. with those readings I had 12 volts at the BIRD's trigger wire to the Trombetta. I cut the wire to ensure it wasn't a back-feed from somewhere else and it was still hot.
Fingers Crossed!
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