You can now convert your old generator equipped Harley to a reliable 12 volt alternator system that gives 17 amps. The alternator bolts in place of the original generator. Kit includes alternator, regulator/rectifier, gear, oil baffle kit and mounting screws. On 1941 thru 1957 Big Twins, the generator screw holes must be enlarged to 5/16" to fit the supplied generator screws.