Hi All,

The window on the passenger side of my 1985 W123 wasn't working, so I took the door panel off and put 12v (10amp) directly on the regulator using my battery charger to check if there was a problem with the power supply.

The problem is that when I put the power on, the regulator works for half a second and then stops. When i switch the power off and on again, the same thing happens.

Does anybody know why this happens?

Thanks!