There should be no feed from the BIRD. It just tells the Trombetta to open or close. Most of the small battery drains that I have seen come from the radio which had a lead connected directly to the battery to power the clock and some memory so you don't have to reset the time and date every time you turn off the disconnect switch. I hooked up an on/off switch to my radios to turn them off completely when I store the coach or dry camp.
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