I had disconnected the battery to install the hitch. Since connecting the battery back, the fuel gauge is showing at empty all the time(even though I filled up the tank today), the headlights on auto are 'on' even in bright daylight, the phone will drop connection and the radio will not turn back on for a while.

Anybody else experience this?

BTW, I took lot of pics during the install and will do a write up with more pics than Mr. Bill Barnes. There were couple of steps missing there.
And thanks to X5world as myself and Chefwong teamed up to install the hitch together on their X5s.