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Sounds like to me the battery is not getting fully charged and therefore as soon as a load is applied it quickly discharges. A battery to get fully charged by your truck would take about 20 hours. Hopefully it is as simple as the disconnect switch in the off position. If not, it points at the converter not doing its job of sending voltage to the battery. To determine if that is the problem do the checks as suggested by jeffba.
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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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