Hi, Anonymous before testing any electrical component in the Charging System it is "IMPERATIVE" that you have a fully charged battery of 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage, the battery is faulty and must be replaced. AGM type batteries fall into this scenario more so than lead-acid batteries. All voltage readings will be on the DC scale except for Stator Output which will be AC you will need a multi-meter to conduct the following tests. "WARNING" never plug or unplug any electrical connector in the charging system with the engine running!
1. Check battery terminals for damage or corrosion, check battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
2. Check the voltage drop at the battery when you hit the starter button, anything below 9.6 volts you might have a faulty battery.
3. Make sure your voltage regulator is properly grounded with a clean tight connection, then check voltage at the battery with the bike running between 2000-3600 RPM, depending on your system specs, your readings should be 14.3 to 14.7 volts. If you are not getting these numbers or the reading is 15 volts or higher replace the voltage regulator.
4. Faulty regulator diodes can allow excessive amounts of voltage to go back to the battery causing it to overheat, boil its contents and swell the casing. The excessive voltage will also spike the charging system allowing light bulbs to surge brighter than normal until they fail along with the main circuit breaker.
5. Unplug the connector to the alternator and hook your multimeter leads to the alternator (pin/socket selection does not matter) set the multimeter to AC volts, at an idle the multimeter should read 16 to 20 volts AC. at 2,000 RPM 32 to 40 AC volts, 3,000 RPM 48 to 60 AC volts. If you are not getting these numbers, you may have a faulty alternator rotor.
6. Set the multimeter to OHM'S, connect one lead to the alternator (any pin/socket) and the other to the ground, the multimeter should read infinity. Connect both leads to the alternator multimeter should read 0.1 to 0.2 ohms. If you are not getting these numbers, you have a bad stator.
7. Check all wiring in the charging circuit for worn or chaffed spots and all wiring connectors in the circuit for corroded, broken, or loose pins/sockets, which is the # 1 offender.
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Good luck and have a wonderful day.
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