If your batteries are 'dead' there is no coming back for them. They will have to be replaced. If they are severely discharged they may be recoverable. Put a seperate charger on the chassis battery and charge it up. Start the coach and get the coach in use mode and let the converter go to town on the coach batteries. Make sure you check the water level in the coach batteries while you're at it. I had the same thing happen to me about 10 years ago. I had to replace all the batteries in that coach. I winter with no charging or water maintenance will kill a lead acid battery.
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Lt Keefer
2018 Hurricane 29M
CHF, Saf-T-Plus, SumoSprings
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