Hopefully someone that has a 3790RD can look at theirs to see if it's wired the same way. It seems strange that you have no other breaker for the rest of the trailer if the black box you are referring to is in fact a breaker for the hydraulics.
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Lenny and Ros
2012 Montana 3400RL,680 Watts Solar,4xT-105 Trojans,GP-ISW2000-12 Inverter,Trimetric 2020, EMSHW50C
2009 Chevy Silverado 3500 LTZ Duramax 4x4 CC Dually, Banks Speed Brake
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