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You might check and see if the Trombetta is closing for some reason after the engine heats up. The Trombetta is supposed to stay open to charge the house batteries after the engine starts. Upon engine start, the Trombetta is closed and shortly thereafter the BIRD opens the Trombetta and it is supposed to keep it open until after the engine is shut off. It sound like the BIRD may be opening the Trombetta charging your house batteries and then for some reason the Trombetta is closing which would result in the house batteries no longer being charged. The way you could check this is to measure the voltage at both terminals of the Trombetta before you start the RV. They should read differently, the same as the charges on the house and chassis batteries. Then when the house batteries show that they are being charged by the engine (after the Trombetta opens) check the voltage at the terminals again with the engine running. The voltage should be the same at both terminals indicating the Trombetta is open. After the house batteries stop being charged by the engine, with the engine still running check the voltage at the Trombetta terminals again. I bet you will find the voltage different which will indicate that you have a bad Trombetta or a bad BIRD - which is not keeping the Trombetta open.
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