My left rear window is driving me nuts. Most of the time it will not work. Today, outdoors, I took the door card off and disconnected the window motor from the wiring coming from the switch. With the engine off, a meter on the wires from the switch shows 11V and switches polarity as it should when the switch is toggled in each direction. So I concluded it’s not the switch. Then I applied 12v from a battery charger to the motor wires. By switching the +ve and -ve, the window goes up and down as it should. So I concluded it’s not the motor. The wiring from switch to motor on the S2 is connected by bullet connectors. I cleaned them and reinstalled them - no improvement. I cut them off and replaced them with insulated spade connectors on each wire. No improvement. I left the door card off and put the car back in the garage and, you guessed it, when I tried the window it worked. Later I took the car out for a drive and the window would not budge again.
Any ideas? I might try removing the wiring connector and temporarily twisting the connections together and insulating them - just in case I made a bad connection when I installed the spade terminals. If that doesn’t get the window operating consistently, what’s left? Replace the motor in the hope that fixes it? The motor looks a tricky thing to get out so I’d like to be sure I have tried everything else possible first. Any suggestions, please?