[Bottomland4x4]

What kind of truck conversion? I know you said it's a freightliner, but where are the house batteries in relation to the truck batteries? My truck batteries are located close to the driver side fuel tank, then there is a battery isolator and the house batteries are to the right of the truck batts. My unit will automatically charge the house batteries while the truck is running, there is no emergncy start on the generator, it will pull from truck batteries if needed.

9 volts at your lights is very low, could the batteries be severely discharged? I leave my unit plugged in and it keeps the batteries charged and fridge cold at all times. There is also a display to check voltage and it shows around 13volts when plugged in. On my old toter I have seen it as low as 11 volts and then I had to jump the generator to start it back up.