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Its better u take it to a motorcycle service, they can check the voltage that the scooter produces to charge the battery, maybe its the regulator or the magnetic field.
OR A VOLTAGE REGULATOR,IF THE STATOR IS BAD,IT WONT CHARGE CHECK THE FUSE,BATTERY CONNECTIONS ARE CLEAN,ALL WIRING IS TIGHT, AND HAVE VOLTAGE REGULATOR CHECKED.
If the battery is good, but the bike is not charging, it is either the stator or the regulator/rectifier. If you confirm that the stator is good (resistance and output check) then the regulator/rectifier is the problem.
is battery more than two years old? if yes replace battery. Battery voltage should be >12.4 volts minimum. if it wont hold this charge its bad. Check all the wiring on your bike to make sure that you dont have a shorted system that is draining down you battery.
corroded, burned, loose connection from the stator to the regulator (likely);
faulty stator (least likely).
The stator would be producing relatively high AC voltage while revving the bike. The stator output AC voltage are fed to the rectifier / regulator through 3 white wires. Check calls for testiing for the presence of the AC voltage on any pairing of the white wires before and after the connector before the voltage regulator. Check on the regulator calls for checking the battery voltage when revving the bike (14.5 VDC).
check that all the wire connections are good, start at the 3 stator leads and follow it to the rectifier and to the battery, also if you have a multimeter, rev the bike up to 3000 revs and hook up the multimeter to the battery (positive to positive and neg - neg), this will give you the charging voltage, should be between 13-15 volts dc, if its not, it could be a bad stator, but is more likely to be the regulator rectifier unit
The most common problem is the 3-wire connector being burnt between the stator and regulator/rectifier. It has also been commonly reported that the regulator/rectifier and/or stator may need replacement.
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