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I don't think so Ed. If that were true, the voltage at the two battery banks would not be exactly the same as soon as the Trombetta opens. The BIRD senses the charging voltage, not the state of the battery and as soon as the charging voltage gets above 13.1v at the house batteries for the requisite time, the Trombetta opens and charges both the house and chassis batteries at the same time. You can confirm this by plugging into shore power waiting for the Trombetta to open and then immediately shutting off shore power. The house batteries which read 14.1 or 13.6v charging will immediately fall to the voltage they started at. Because the batteries have not had time to equalize, the chassis battery will read close to where it was when shore power was turned on. The isolator function only works when not on shore power or generator and the voltage at the batteries falls below 12.8v.
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