To reply to several different comments.
With 14.8 volts on the house batteries from about noon time on, due to the solar system, the B.I.R.D has had plenty of time to sense this voltage if working/wired correctly; and if this is what has the time delay. The same thing applies for the two times we have been on shore power over night where the converter output has been measured at 13.2 to 13.6 volts on the house batteries.
The isolation relay I have verified works by pressing the aux start button and watching the chassis battery increase from 12.2 to 14.8 volts, again on solar to the house batteries.
From the diagram you of coarse can't tell where the white isolation relay wire is physically landed.
From the diagram a 5 amp fuse is supposed to be wired in, ours is actually a 15 amp.
Having worked with the bulb snatchers, electricians for 20 years I understand wires don't always get landed physically per the diagrams but are electrically correct.
The limited checking I have done so far indicates a missing wire or failed component.
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