Ammeter to Voltmeter...who does it?

FLynes said

If you look at the far left bulkhead connector the 10ga. black wire in the lower right is from the alternator and, in turn, goes to the ammeter.

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There's almost certainly a big spliced junction before the ammeter.
If it the ammeter reads zero when the engine is running and the battery is charged, that's what's going on.
The alternator is supplying power at 14 Volts give or take some. Power flows from the highest voltage source to the where ever its asked for. The battery is only 12.5 Volts give or take, so the alternator is sending the current to the ignition etc, but we don't see it on the ammeter 'cause its not in the alternator's output line.