Need some help on connecting up a TV tuner to run an IPOD and digital TV..

I recall reading one of the threads that mentioned the "alternator whine" but didn't really understand.........I still don't really (electrics of any description simply confuses me - my wife worries if I even wire a plug up), however, the main thing is I now know to check and sort it before putting the entire car insides back together, so thanks!!!