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You can read the voltage of the chassis battery and the house batter(ies) from the two poles of the Trombetta. If the batteries are above 12.8v, the BIRD keeps the Trombetta open. So if the batteries are above 12.8v, the house batteries will be connected to the starting system and the engine will start using the house batter(ies) without using the aux start switch. However, when the batteries fall below 12.8v, the BIRD should tell the Trombetta to open, disconnecting the chassis battery from the house battery so the chassis battery does not discharge the house batter(ies). If the batteries are below 12.8v and you can still start the engine with the chassis battery disconnected, then either the BIRD is not telling the Trombetta to open or the Trombetta is not opening or the auxiliary start switch is miswired or locked open. Talking to the Trombetta guru, it apparently almost never fails. That seems to indicate that either the BIRD is faulty or, more likely, the system is miswired or the aux start switch is locked open.
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