Yesterday, my wipers on my 1968 280S (w108) would not turn on whatsoever. I pushed in the wiper lever to engage the wipers and nothing happened. this morning was no different. Any ideas what would cause this?

As an aside, could it be the way I turn on my wipers caused a problem? I normally press in the wiper lever to engage the wipers and once the wipers begin the first sweep, I immediately push in the wiper lever to disengage the wipers (thus getting one clean sweep of the windshield). This gets me by for several minutes in a light rain (i.e. I don’t like to keep the wipers going if I don’t need them). However, on this occasion, I may have pressed in the lever to disengage the wipers too soon (before the wipers even began to engage). Perhaps that may have caused them to stick? Any help you can provide would be most appreciated.