I am a new member and new owner of a 2013 C-650-gt. It looks like the previous owner used it pretty hard and also didn't read the manual. I am getting things straightened out but I have 2 problems that may or may not be related. The the windshield will not go down, it is in the full up position, and the speedometer doesn't work but the odometer does . I am wondering if it is an electrical problem and if they are related. At slow speed the speedo mushes along at what I guess is about right but but it sort of floats around. At high speed it will not indicate any speed over 50 mph. any ideas of the cause and remedy. Thanks