2004 RC battery not charging while riding. Meter reads 12.4 volts at idle, but isn't charging enough to start the motor after I turn it off. Wondering if someone could help me diagnose the problem. Stator, pulse generator, or CDI box?
Disconnect the rectifier/regulator connector and measure the stator coil resistance.
For each coil, it should be .2 to .5 ohms (although I've seen .6 ohms).
If a reading is open or out of spec, you may have a bad stator.
Then measure each winding to ground. If no resistance, you have shorted stator coil needing replacement stator.
If the stator checks out, then it might be a bad rectifier/regulator.
Are you sure it is not the battery just not holding a charge?
We'll probably have to wait and see what his charging system output is at around 4000-5000 RPM.
If it's 13.5V or better, then his system is ok and it's probably the battery not holding a charge.
At idle the bike is using the battery to offset the lower charging output.