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What all do you have on when the converter fan is running? Have the batteries ever been depleted? That fan motor typically indicates the converter is trying to supply power to "something" whether it's trying to replenish depleted batteries or supply power to something else and the batteries.
Our converter used to run a lot from just turning on a lot of lights when opening up the trailer. They were all incandescent at that time. Replaced them all with LEDs and that stopped that. With an 18 I don't know what kind of lights it came with.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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