Not entirely true.....see result from the urbanDictionary below 1.dumdass 1 n. Corruption of "dumbass", utilized occasionally by mentally challenged AOL users. Use of this word indicates that one is a dumbass. Thanks fellas, have located the fault, wires from body to tailgate broke and have been bodged in the past. Have had to take it to a garage unfortunately as I am at work all week and it needs retesting by Friday, again thanks for the advice.