May also buy the shore power kit so you can plug in . I'm ready to replace my junk pac. keeps breaking down
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you still could use the inverter,cause it gets the power right from the battery.
if you had shore power, it would save from running off the battery or running the apu.
if the truck has a DPF the APU needs a DPF for C A R B
so it's not the tri pac, it's the espar heater. you may try cleaning the glow plug or run some K-1 to clean it out. The nice thing about the espar you can fix it still in the truck.