Originally Posted by jtstromsburg
?? Reversed battery wires?
That sounds exactly what it is, and the reverse polarity fuse(s) are blowing.
It happens a lot, and the reverse polarity fuse(s) keep the converter and electronics from getting damaged.
Originally Posted by NCFun
Is that what happened, the battery wires were hooked back up backwards? It's real easy to do, especially if the wires are black and white. Since it's intuitive for the black wire to be negative like in a vehicle, it's common to hook it to the battery negative post.
However, the RV is wired like a house, and the black is the hot wire in that color code scheme usually.