Am here seeking advice where to look first or second. 2003 XC70 drove to the store car ran great. Came out started it and the radio went off,air con stopped, lights locks windows all no go. many warning lights. It ran so I drove it home but it didn't have a lot of power. Had been running great since I changed some relays and the alternator. The battery had been fully discharged a number of times before I put in the new alternator. (I suspect there was a phantom draw from voltage regulator.) Thanks a lot for any advice or links. I sincerely appreciate it.