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from the first page of the manual for my BIRD controller
"The BIRD (BI-DIRECTIONAL ISOLATOR RELAY DELAY) performs two important functions. It provides a
method of charging the coach battery from the engine alternator and charges the chassis battery from the
converter when the coach is plugged into shore power. When neither battery is being charged, the batteries
are isolated from each other to prevent the loads of one battery from inadvertently discharging the other battery."
Intellitech 00-00362-100 BIRD GAS
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