Jake Fatboy
Member
Hi All! 03 Fatboy charging system not working. Bike starts and runs great for about 75 miles with a charged battery. I keep a trickle charger on the battery between rides, so don't know how long this has been going on. Load tested my 6 month old HD battery. Tested good. Voltmeter across battery at idle and revved up only shows 12V or less. Performed all of the tests in Glide's "Testing the Charging System" (great procedure!) Regulator is 3-phase, so had 12v on each pin to battery negative. Stator measured good (no shorts to chassis ground and good continuity between pins). Started bike and measured 30-40 volts AC from the stator, so I bought and installed a new regulator and still don't have 14 volts across the battery. Now I realize that when I measured the 30-40 Volts AC from the stator that I measured 40 volts across two pins and probably only 30 volts across two other pins, as well as less than 20 volts once, probably from different pins. Is this fairly positive that the 3-phase stator is bad and should be putting out 40 volts on all 3 phases? I guess it doesn't hurt that I have a new regulator. Should I replace the rotor too? Thanks for your help!