1963-1969 Chevrolet K10 Pickup L6 3.8L 12si High Output Alternator Pulley:V-Belt Pulley This is a direct fit

This is a direct fit high-output alternator aftermarket replacement for 2013-2015 BMW 550i GT 4

This is a direct fit high-output alternator for the 2002-2006 Mazda MPV 3

These all require more amperage than the stock alternator is capable of providing

As far as 2GA vs 4GA

This is a direct fit high-output alternator for the 1965-1966 Oldsmobile Dynamic 7

1963-1969 Chevrolet K10 Pickup L6 3.8L 12si High Output Alternator Pulley:V-Belt Pulley This is a direct fitFitment: This is a direct fit high output alternator for the 1963 1969 Chevrolet K10 Pickup 3. 8L. Being a direct fit, this alternator fits directly into your stock alternator location. Plug: This high output alternator comes with a 14. 8 Volt GM Style Internal Regulator with one wire connection. This alternator is not plug and play and must be wired with the one wire connection. NOTE: If you require charging at a certain voltage setpoint, we offer a