u013 310 EC Shore power shows 110v on a/c gauge but 0v on 110v shore power

two cords for shore power, both good but I don't show any power to 110v system only 110 v to a/c. Tried different station to no avail. Had to have my radio amp replaced and wonder if they unplugged something or is there an additional fuse somewhere. when I use generator both work fine.. Any ideas
Comments
Boat Name: King Kong
"Boat + Water = Fun"