my delay wipers are frigged. the wipers work at one speed, to get them to park at the bottom of the windshield, i have to twist the knob all the way back. they worked fine untill i took the engine out last fall, the have been driving me silly since then. could it be the switch on the steering column(it took an awful smash from an angry moment)? the turn signals still work, the cruise controls all work and the high-beam still works. any help would greatly appriecated.