Charge and load test the battery first, While doing this, perform the *sniff* test of the primary. Connect back up and perform the powered testing of the charging system. This is when you start Step 2 using a test light and DMM for isolating potential bad regulator and checking uniform stator winding and rectifier ckt ohmout readings unpowered. :s
Check this Self Help Tip...Testing The Charging System - Harley Davidson Community
Check this Self Help Tip...Testing The Charging System - Harley Davidson Community