power up {electrical}

As to the no rear lites; Do the brake lites work?
If no, and all the fuses are good, I would remove the drivers kick-panel and make sure the body connector behind there is fully plugged in. If it is then check the sockets for juice. If juice is there fix the ground back there. But if no juice at the sockets, go back to the body plug and check there. If none, back up to the fusebox; check both sides of the fuse holder.( Those fuse holders have been known to cause trouble. You may have to clean the clips.)If no power there back up to the light switch.
The light sw is most likely the cause of both problems, so I would just go there first.