Has anyone had problems with the wiring in their mk3 golf or similar?

I'm experiencing a 'drain on the battery' for some reason, I think it may have something to do with the power windows in the rear.

I can now operate the power electric windows without the key in the ignition.

One of the rear windows does not operate at all now, just a clicking noise coming from behind the glove box area or near to it when the dash or door switch is pressed.

The other windows work as normal, but really there should be no power getting to the windows without the key in the ignition.

Any help would be welcome please.