Sorry, it's an 89 MB 190 E. Don't think it's the switch, just replaced it. I put a voltage meter on the contact with the switch wire attached and it shows a 12 volt load when the power is on and shows the same when the switch is pushed. I dabbed a little all purpose grease in the regulator tracks and that didn't help. It still needs help with a hand to open and close. ???????????? Tomorrow I am going to try running a jump wire from the console switch to the hot lead of the window motor switch on the door. This should bypass any "regulator" that is lowering the voltage.