I have what I think is an easy problem, I have a side sticky bumper. So the two outside bumpers are joined together with circutry, and there are two switches for each. For lack of proper terminology, I will just refer to them as the start and quit switch. Both switches need to be open for the bumpers to switch off. Problem is, one will not. Video, here if you want to see it... http://tinypic.com/r/am8k9j/9 Showing each side activating.