I would put a multimeter to the rear power window fuse spot, I think this is a good place to start. If it works as you need it, no need to look further.
If you don't have a multimeter, just wait for your fuse taps, there is no harm in doing it that way, you can't ruin the camera trying different fusible locations. But try all the locations I talked about first, it's a good start and it'll save you fuse pulling time.