I think your ammeter is wired backwards...
Put your voltmeter across the battery with the engine running. You should have about 13.5V if everything is working correctly, and you'll probably have 14+ when the F terminal is grounded. If you have less than ~13.5V and grounding the F terminal results in a voltage increase, it is not the S/G. If grounding the F terminal does nothing, it's the S/G.
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