Going for an OEM look but want a high output alternator? This is for you! This 150A alternator can be connected in 3-wire OE style, or in 1-wire hook up for custom applications. GM 12SI style. Satin finish with large composite fan and billet pulley. Minimum 6ga charge wire required - not included. Please read information in the TECHNICAL SPECS tab below. Converting from an external regulator?