It sounds like you didn't disconnect the shore power and the converter was providing 12V power. That would account for the light working and the degradation of the slide (the converter doesn't have enough amps, it needs a battery). I bet the switch is wired correctly.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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