Look underneath where you can see the starter. Remove all rings and watch before checking cables. Feel the cables to ensure that they are tight. If so, follow the hot lead to the starter solenoid. Should be a large cable on each side with a small control wire. Have someone try to start. You should hear/feel the solenoid engage. If you have a meter, check for 12v on the batt side and the on the starter side when engaged. If you find power is getting to the starter and it's still not turning, might try rapping the starter housing with a hammer or something similar. Hit firmly but not to hard.
I had a similar situation and found wires loose on the starter. Just be careful if you have to tighten as there's enough amperage available to weld with should you short the wrench to ground.
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