If the batteries are dead the converter is still trying to charge them. The converter may be over worked and unable to supply power to the lights. You could have a shorted cell in one of the batteries effecting the converter. Chances are replace the and problem solved. Slides and hydraulics require charged batteries.
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Tony & Donna
2022 Montana HC, 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
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