bro just do big3 for ur car, its not that unless u have a heavy sound system u have to do this, it just charges ur battery quickly and also stabilizes the voltage and flow of current in body through grounding, belive me u would feel a difference by doing it, if u have a digital voltage meter u may chk the volts before and after the big3 upgrade....
my experience: since i am into car audio so big3 is a neccesity for me, but long ago i didnt had one, before doing bi3 i chkd my volts, on idle it were 13.2-13.5v and full rev 14.2v...
and after doing big3 my volts were of these ratings idle: 14.4v and with full rev 14.9-15.2v, and my voltage diming provs were finsihed, headlights become a lil more bright........
//youtu.be/http://www.youtube.com/watch?v=iX9Rcq5DnKw