Motorhome will not switch over to aux. gas tank ??
[Gary B] Hi Effie, you haven't giving enough information, (class a/claas c or b, Ford, Chev, Dodge etc.). The first place to check would be (you said we hit the button and nothing) I am taking it, that it's electically controlled, do you have +12 VDC at the switch, if so the find the fuel switch valve, it will be located on the frame with any number of fuel lines coming and going, check for 12 volts at the valve, if you have voltage then it maybe a deffective valve assy. Good luck and happy trails GB