How many amp's does a alternator from a 2003- 2005 any year between those 350z have. IM upgrading my system and just want to know if im going to have to buy a more powerfull alter I have looked everywhere except for the alternator on the car and im sure its on there im just to lazy right now to go do it.

 

Look in section SC of the service manual for your year. There's a sub-section titled "Service Data and Specifications". The info you want is there. For the '07, the alternator is rated at 150 amps.

 

The 03&04 FSM lists the alternator at 110 amps.