1986 760 Turbo. The rear left window won't budge. Does anyone know which fuse that is? Or what else to check if replacing the fuse doesn't work?

 

Well the windows are on the same fuse as the A/C. If the A/C works the fuse is good. All the windows are tied to the fuse.

 

It is the switch, the motor or the regulator itself, or STUCK.
Have you tried the front as well as the rear switch? This would eliminate the switch as the reason.
The motor itself rarely fails,the LR regulator is usually rarely used so I doubt that's where the problem is. I'd bet the window is just stuck from non use. I'd take the door panel off and make sure it all nice and lubed in there... Not a hard job.

 

All the other windows work (front and back switches). A/C works. Until recently the back door switch worked fine on the rear left and the front door switch half-worked (it would open it but not close it - I had to use the back seat switches to close it). Now neither front nor back switches work.

I'll try taking the panel off and lubing it up.