Ammeter to Voltmeter...who does it?

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

I should have said was that current passes through the ammeter at all times, whether the motorhome is running or not.
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.

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.