Now the question of why it doesn't always work... Assuming the battery is sufficiently charged and the cables are clean and tight, see if this helps.
You didn't describe the symptoms, but if you supply voltage to the "S" terminal, and nothing happens, as in no clunk of the plunger, typically there are 2 causes:
1. The brushes are worn and failing to complete the ground circuit. Also oil fouled brushes/commutator or any open circuit in the starter can cause the same open ground circuit.
The solution, repair the starter.
2. There is sufficient voltage drop between the battery, starter switch, and neutral switch to not have enough power to pull the solenoid plunger in. If the starter switch and neutral switch check out, the problem is too much resistance in the wire.
The solution, mount a heavy duty relay (Ford fender mount starter solenoid) near the starter. Using 10ga wire, connect the solenoid power terminals between the battery terminal of the starter and the "S" terminal on the solenoid, and connect the wire removed from the "S" terminal to the coil terminal of the relay. This works because the relay is much easier to pull in than the starter solenoid.
If the starter "clunks" but does not spin, the solenoid internal contacts are worn.
If the starter spins but the engine does not, the starter drive is worn or oil soaked.
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