If your converter (charger) is working properly (on shore power) it will charge the coach batteries first. Then if the BIRD is wired and working properly, the charge current will relay charger output to the chassis battery. Sounds like the switch to the chassis battery isn't happening. Is the chassis battery good? A bad battery can cause a no switch condition. Chasing down BIRD wiring can be a PITA but if the batteries are otherwise good you at least know where the problem is.
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Axis 24.2 "was" tug'n a JK
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