I forget the particulars but what you need is a noise filter for the alternator, that should cut down on the "jump". You may not need a new alternator. If you have a TV in there now and can find a 15" 12V LCD "TV", I think you would be better off than trying a PC LCD in the car...
And I am sure that is what was causing the tv to go nuts its not jumpin no more the radio is not humming on am so I have to bet the alternator was throwing interference thanks for the help.