NAVPad Power harness is meant to power just the NAVPad itself. You could upgrade to our deluxe power harness which will power a WX Receiver, GPS, and/or a PDA/XM Music Player
By the way - I flew through that weather system on Friday. There was a lot of nervous chatter on the radio with the turbulence and thunderstorms associated with the front. It became obvious to me that ATC's radar was not cutting it when I got a vector right into a big red cell. I told them updated radar downloads