duckblaster67 wrote:On the 10SI you just need to swap out the stator. Wilson Electric makes a 100amp stator: part # 67-01-3322A.
12Si has a different rotor, different stator, different rectifier and a different regulator. You can swap only the stator coil as DB suggests, but u won't get the intended output without the 12Si rotor/regulator. The 12 Si proper rotor has different fingers than the 10Si and a different coil draw ~ 5 to 6 amps on 12 volts whereas 10Si rotors generaly draw between 2.5 to 3.5 amps. Less primary magnetic field = less secondary output.