Ammeter to Voltmeter...who does it?

Cool.
Could the connector be a fusible link?
(the part leading to the solenoild)

Nope, it's just two wires with a connector. No idea why they have it like that, but the factory must have had a reason.

Yes - if somethingis turned on, current will flow through it. Headlights for example, or radio if the key is in accessory position. Otherwise it's hot, but there's no flow.

I think I'm misunderstanding you. How can it be hot but have no flow. What I understand as "hot" means that, when you put a test light on it, it lights up or, when you put a voltmeter on it, you get a reading. With the key out of the ignition, when I put my voltmeter on the bulkhead 10ga. red wire inside the cab, the one that connects to the fusible link, I get 12.85V. When I put it on the 10ga. black wire inside the cab, the one that connects to the alternator, I get 12.72V. This tells me that it's all hot, that there is current passing through those wires, as well as current passing through the ammeter.

Be interesting to see how the charger converter works and is wired with the condition test button.. Neat stuff. Ammeters on chargers seem to be pretty common.

So here's a pic of the back of the Power Distribution Center....the ammeter is pictured with the brass attaching clip. The white wire from it is connected to the other white wire, which goes to the panel light, and a green wire, which connects to a buss bar. The Charger/Converter green wire goes to the buss bar as well, as does the Coach/House battery.

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The 100A Smart Charger/Converter.

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