Thank you Javelin. I did check the voltage after the BIRD fired off its 12v signal to the Trombetta relay. WIth the engine running the chassis side is 14.1 and the house side was 12.5, so the relay must be broken. It seems safe for me to replace it if I am careful to cut power. I like to assess risk if I botch the repair but this one seems OK to proceed.
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