Do you have an electical Multimeter ??
What's the voltage at the starter motor possitive terminal when you press the starter button ? The cable should run directly to your starter relay box.
Earth the Neg. terminal on meter to the frame.
If you're getting more than 12V then your motor might be jammed. Give it a whack.
If nothing, remove the motor and jump it directly to a good battery and see if it spins.
If you're not getting good voltage to the motor then check all terminals. Check the voltage on the other side of the relay and see what it is when you press the starter.
Check the safety switches too. These can disable the starter motor but generally the relays don't click in this case.
If everything works out you might have a massive voltage drop somewhere. You can check this by doing a voltage drop test.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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