If You may use a VOM and have a person, then (Using the fixture plugged in) evaluate the transformer output normally 12volts, if nothing at all there, then evaluate the transformer input 120 volts, When you've got the a hundred and twenty volts, then the transformer is undesirable most likely. http://vacuumcleanerrepairshopne17271.bloginwi.com/35599668/5-simple-techniques-for-shark-vacuum-cleaners-boulder