Put a meter on the battery and get a real-world reading. One at the battery by itself with nothing on, and one with the key on and trying to turn the starter motor. A good battery will read 12+ volts at rest and not drop more than a volt or 2 when trying to start. If that's good, you have a loose or corroded connection between the battery and starter motor. Clean and check all the connections until you find the problem.
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