Take a DC volt meter and check the voltage at the battery. Red probe on positive + terminal and Black probe on negative - terminal. If it reads 12.6 volts it is fully charged. 12.4 and it is 75%, 12.2 and it is 50%, 12.0 and it is 25% charged. Less than 12 volts and it is considered a dead battery.
Check the battery and see if it is charged or needs to be changed. Check the battery cables Check the starter condition
Check your power . Battery and see if it is charged.
This could be the voltage regulator. Both the positive from the battery and the starter would be connected to it.
Something is draining the battery. Check all lights. Glove box, trunk, etc. Also check the power window switch.
First, check if you battery if properly charged, and 95% of the time that is the reason.
Check the starter.
A battery float charger is intended only to keep a fully charged battery from losing its charge. It will NOT work to charge a battery that is discharged or damaged. Check the voltage of the battery to be charged. Do not use charger if the battery voltage is less than 9.6 volts.
The battery is most likely being over-charged. Check the alternator diodes or the voltage regulator.
Low/bad battery, bad battery connection. If the battery isn't getting fully charged you might not be able to start. If it isn't getting charged, check the alternator.
Check the voltage at the battery with a DC volt meter. It is reads 12.6 volts is it 100% charged. 12.4 volts 75%, 12.2 volts 50%, and 12.0 volts 25% charged. Less than 12.0 volts is a dead battery. If the battery will not hold a charge with the negative cable disconnected it has a dead cell and must be replaced.
The battery light will be illuminated on the dashboard and later the battery will go flat as it is not getting charged Garages can check this for you if your battery is frequently getting flat.
It could be a bad battery or regulator. To check the regulator to see if it putting out the correct voltage check the battery voltage while the bike is running. It should be around 14 volts.