My 300 SDL drivers seat is back in and working 100%. Thanks to Jim who told me how to test the motors. To Curt and Marshall for giving me the switch cleaning tips.
Three functions would not work and the electrical contact cleaner fixed all three. I pulled the large switch knob, vacuumed first. then compressed air and then the contact cleaner. A few switching cycles and everything began to work. Harry Watkins Newton, MS 86 SDL Silver 85 300D Euro 86 SDL Gold 81 240D manual trans