rear power window

[methos76]

I have a 66 t-bird and just had all the window motors replaced, every window works except the right rear. worked when tested on the bench but after box was installed nothing it has power wondering if its a ground or something wont work from either switch

[mark1965tbird]

I had nothing but trouble with 2 replacement quarter window motors. Check the regulator, spring, and manually try to operate the window in it's cassette on a bench (motor out). My problem was fixed by buying a rebuilt FOMOCO motor.

[Rusty57]

Mya unfortunate experience these days is that just because it is a new or “rebuilt” part does not mean it is a good part.

It sounds Ike you are doing all the right troubleshooting steps. Just be patient and organized. Don’t be surprised if you determine that the motor has failed already.