airhead charging system not working
Posted: Fri Apr 26, 2013 8:01 pm
I went for a short ride today today and noticed the volt meter i installed was not showing the normal charge rate, in fact it showed a slight decrease when running, down from 13+ to about 12.2 when at idle and 11.9 when running above 2000 RPM. Voltage went up to 12.4 with bike off. Got home and checked battery, fully charged at 12.4 across terminals and same between + and any good engine ground. Bike starts and runs fine but no voltage increase at battery when rev'd. Disconnected everything 'cept large red wire at battery and same thing. Lights are working at full brightness and dash lights come on when key is switched on, except for the Red charging light which just lights dimly and remains dim at all RPM's.
So given the gen light only glows dimly but rest of lights glow bright, alternator or diode board? or wiring from Alt to diode board or between diode board and starter to battery? Not sure how to check alternator but can look for voltage at DC output of diode board and for shorted diodes.
Check brushes as well I guess but not sure beyond that.
thoughts on what needs replacing/repair?
the one good thing about this is that had I not installed the voltmeter i would not have known I had a problem until the battery ran down and bike quit in the middle of some nowhere place since in the daylight I could not see the dim glowing of the charging light at speed and that it did not light brightly at idle ( which it normally has not been doing anyway, but since the voltmeter showed normal increase to 13+ volts above idle I figured that my idle was a bit high).
Anyway the voltmeter has paid for itself already for sure!!
RM
So given the gen light only glows dimly but rest of lights glow bright, alternator or diode board? or wiring from Alt to diode board or between diode board and starter to battery? Not sure how to check alternator but can look for voltage at DC output of diode board and for shorted diodes.
Check brushes as well I guess but not sure beyond that.
thoughts on what needs replacing/repair?
the one good thing about this is that had I not installed the voltmeter i would not have known I had a problem until the battery ran down and bike quit in the middle of some nowhere place since in the daylight I could not see the dim glowing of the charging light at speed and that it did not light brightly at idle ( which it normally has not been doing anyway, but since the voltmeter showed normal increase to 13+ volts above idle I figured that my idle was a bit high).
Anyway the voltmeter has paid for itself already for sure!!
RM