I am having electrical issues with my 1990 ford econoline e150. First the bed in the back does not go down. Also it seems like the electronics do not turn on as well i.e t.v. rear light fixtures ect. everything else works perfectly fine just not the accesories back there. could it be a problem with the inverter not working(added photo of the model)? the radio turns on the small lamp in the front works as well. I will attach photos of the type of van to give a better idea for you guys.