I've got a wiper problem, I've purchased a new motor, park switch, and a turn signal switch. Still have the same problem. When I turn the wipers on, they stay on and eventually go off by themselves. I'm not sure but the only thing left to replace in the circuit is the "switch" the part the turn signal switch lever plugs into. I've pulled it out of the column and it does look coroded. Does anyone have any thougts on this part, what's it called? and how do I get a replacement for it?