Compatibility - Automotive new alternator replacement for BMW for 325Ci 2004,for BMW for 325Ci 2005,for BMW for 325Ci 2006,for BMW for 325i 2004,for BMW for 325i 2005,for BMW for 325xi 2004,for BMW for 325xi 2005,for BMW for 330Ci 2004,for BMW for 330Ci 2005,for BMW for 330Ci 2006,for BMW for 330i 2004,for BMW for 330i 2005,for BMW for 330xi 2004,for BMW for 330xi 2005,for BMW for 525i 2004,for BMW for 525i 2005,for BMW for 530i 2004,for BMW for 530i 2005,for BMW for X3 2004 2005 2006 Amp Alternator Specifications - Voltage: 12V; Amperage: 155A; Rotation: CW(Clockwise); Regulator: IR ; Fan: IF; Grooves: 6-Groove Pulley, high output alternator is compact and lightweight, fully compatible with the electronic system of your vehicle Car Alternator OEM - Direct OEM replacement for your malfunctioning part, OE number : 12-31-7-519-721 12-31-7-519-723 12-31-7-521-135 12-31-7-546-284 12-31-7-546-285 11083 Alternator High Output Replacement - Bearing 100% tested to OE standards and repacked with OEM grade lubricant. All dimensions, key mounting surfaces, and contact points are gauged and measured for proper fit. Throught igorous and accelerated cycling tests to ensure the durability of product Replacement Automotive Alternators - (1) Be sure to disconnect the negative electrode of the battery; (2) When replacing, pay attention to the appropriate tension of the transmission belt: if it is too loose, it may slip and cause insufficient power generation; If it is too tight, it can easily damage the belt and alternator bearings; (3) When replacing, pay attention to tightening all screws; If you have any questions for alternators, please don't hesitate to ask us for help in time