Hi guys, thanks for the replies . I am not so great at electrics ,but willing to learn . It is a 1987 HR Presidential class C . Basically I replaced the water heater which was an old American appliance with a new Suburban SW6D. I did pull the panel but could not see anything loose . I have a multimeter to use . I would like to know if I can check if the new heater itself is ok by applying power from an ouside source i.e. a battery .The SW6D is a direct spark ignition. Thanks . Rod