In my 2012 Western star I have household plugs throughout the truck , I have a box in my jocky box where it feeds the power but I'm getting nothing at all for power and of course this runs my fridge , I have a 3000 watt inverter installed and wondering can I make a plug with 2 make ends to feed from my inverter to a plug to power the rest? If not why have I got no power in any of my outlets??