Power Window troubleshooting
 

1988 911 Coupe.
The driver side works normally. Checked fuses anyway and it looks good.
Driver side was working with a bit of a delay. Hold the button down (On the driver door) and then after 2 or 3 seconds the window would work.

Now, there is nothing. No movement at all. I replaced both switches for the passenger door. I checked for any cut wires and can't find any back inside the passenger door. I pulled the connections to the motor and cleaned/replaced them.


Any suggestions? If an electric motor is going would it delay movement like that for a second and then work at full speed before dying?
That seems odd to me. Seems like it is some sort of a loose ground or power somewhere. Any ideas are appreciate.

Did you try putting 12V to the motor directly ?

Not yet. Is the elec connector just a pull off, or is it a push and pull? I don't want to yank it off with too much force and break the connector.

UPDATE: I banged on the electric motor a bit while holding the button down and the window went down. Going up it worked fine. I am guessing this points to a new motor?

You can also apply 12V across the 2 middle terminals of the switch connectors.

The passenger window on my '88 does the same thing. Works well, but every once in a while I do what you did: bang on the door card just above the motor while holding the switch on & it'll go. I think it's a motor problem also. Can probably take it apart & grease it up, but it's easier just to bang on the door. ;)

P/W Motor.
 

If you have fault isolated to the motor,

remove the motor, clean the internal mechanical connections,

and lube the motor shaft and the end with lithium grease.

Gerry

pm me as needed.