First take the battery out and charge it.
Then clean the terminals and cables.
Then put it back in and check the voltage with a meter.
It should be 12.5 volts.
If you don't have a meter, make sure the headlights are bright at least.
Then try to crank it.
The voltage should drop to 10.
If it does not, then current is not getting to the starter.
If it at least clicks, it is getting to the solenoid, so then the solenoid would be the problem.
If it drops below 10, then the starter or battery could be bad.
If when you stop cranking the voltage comes back up, then it was the starter that was bad.
If it does not come back up, it was the battery.
Then if you ever do get it started, you need to check the alternator output goes up to 13.5 when you rev it, because it takes that much to recharge the battery.
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