I am new to the forums having just purchased a 1967 Mercedes 250S that is in good condition, but needs a little tlc. My question...the windshield wiper motor works when I turn it on, but when I turn it off, the wipers stop pointing upward enstead of horizontally at the bottom of the windshield. I can't imagine that is the way Mercedes made them, so I am wondering what could cause this to happen, and how to correct? Thank you in advance.