John, are you connected to shore power? If so check your two wires with voltmeter, the one with 12 volts is your positive coming from the converter.
If your not connected to shore power, check for a ground, either follow the wire to the frame or use an ohmmeter to see which one is connected to your chassis, that’s your ground.
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2017 Eagle 291RSTS
2017 Chevy Silverado Duramax 2500
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