Although there are many reasons that can cause this situation:
1. battery low
2. Switch defective
3. Corroded battery wires. (not the end connectors!)
The Positive and negative cables can be pinched and corroded somewhere down the length of wire. Good battery, lights come on but not enough cranking amps to turn starter.
I will "Assume" you have checked all of these and found to be in good condition.
Replacing the starter it is imperative the Bendix and flywheel line up.
Using the same shims (small metal strips) from original starter often works and recommended. However if there was excessive wear on the old starter Bendix and flywheel the originals shims may not work. Inspect the flywheel to make sure it is in good shape.
Usually the Bendix on the starter will wear out first if a slight misalignment is there. If the flywheel is deeply grooved or has broken teeth. I'm afraid you will need to replace it.
Misaligned gears may be causing the starter bendix gear to hang against the flywheel teeth. This will cause a clicking noise since the bendix can not dis-engage and hangs up.
Make CERTAIN the wire running to the new starter has a clean connection. Do not assume it is good because the connector is shiny. Good small wire brush then a small amount of vaseline on the connector. Should keep the corrosion and any film deposits from forming later.
Adding or removing shims: Be sure the starter engages the flywheel without any metal to metal grinding noises. It is absolutely critical the gears synchronize (mesh together) without hanging or grinding during the cranking procedure.
Good luck!
If all connections at starter and battery are good and battery is fully charged then you may have a bad starter.( new does not mean good) hope this helps good luck.
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