1218OSE Mini 35 Amp 12-V Negative Ground Alternator w/ Pulley Fits MultipleOne (1) New Aftermarket Replacement Mini Alternator w Pulley Fits Multiple Makes & Models Specifications: 12 Volt, 35 Amp, 1 Wire Hook up, 4 1 2" Housing Diameter, 2 3 4" Pulley OD, 1 2" Belt Width, Works with Magneto or Distributor Ignitions, For Negative Ground Systems Only Note: (Simple 1 wire alternator hook up) Run a wire from the alternator through the ammeter to positive side of battery. Must rev the engine to 800 850 RPM in order to self