NEW ALTERNATOR FITS 2006-2009 CHEVROLET IMPALA 2007 MONTE CARLO 3.9L CLUTCH PULLEY 100% NEW and Made with the Highest Quality Components Available Full One Year Warranty Computer tested for consistent Quality and unsurpassed reliability Alternator - Voltage: 12V Amperage: 125 Amps Regulator: Internal Grooves: 6 Source: Aftermarket