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Agree with Beau388 above. Also since you seem to be focused on the Trombetta relay, maybe you think it is stuck in the closed position so that the coach loads are drawing the chassis battery down. There is an easier way to check this:
Measure the coach battery voltage and the chassis battery voltage. If they are different within the accuracy of your meter then the Trombetta is not stuck. Then start the engine. The chassis voltage should immediately jump to about 14 V but the coach voltage should stay the same. If they both immediately jump to 14V then the relay is probably stuck.
The foregoing test works with the Precision Circuits BIM 160 on my Axis as it takes at least a minute or two for the BIM to connect so if you measure quickly you can determine if it is already connected because it is stuck. Maybe the Intellitec Trombetta relay system doesn't work the same way.
David
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