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With gen running, use/store off and engine/alternator off, do you get coach lights working OK? If yes I would think the converter (or inverter/charger) output is working. If no 12vdc lights are working what happens if shore power is connected? If you are boon docking = no shore power so can’t test that. Using shore would check transfer switch connections. So it is possible as GMC says the converter is not working, but you need to verify that also with shore power connected. If still no lights then 120vac feed from auto transfer switch output to input side of converter may not be connected/breaker open etc or the converter has failed.
If, however, the converter is proven to be working though, then one other consideration is if the BIRD or BIM (which ever your coach has) charge sense on the coach battery side may not be detecting the converter charge voltage correctly or has a bad connection/blown mini fuse (usually a 5 or 7 amp fuse near the latching relay). Check the voltage on the coach batteries with gen running and use/store on to see if the 13vdc+ is even getting to the coach batteries.
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