Ammeter to Voltmeter...who does it?
So my final question for you Mopar electrical gurus, because I don't want to overstay my welcome....should a 60A alternator be enough to power my motorhome necessities?
From everything you posted earlier, it sound like it works like this.
When parked, the coach batteries supply the motorhome. There's no connection to the engine and cab electric.
When the engine is running, the alternator recharges the battery. The alternator is wired the main charging circuit at the battery. That's probably why the ammeter showed 25 amps charging.
So the question is what equipment attached to the coach batteries would be running while the engine is running? Additionally, is that equipment regulated to 12.5 volts or will it see the system voltage from the alternator.
Your existing wiring looks like 8 ga or heavier. Routing it more directly as you illustrated maks it less likely to damage the connectors and ammeter, but still could cook the batteries. An alternator that produces more power at idle will keep the batteries from getting drained if the engine is running. But it will also be able to send more current to a completely drained battery.
As far as monitoring the charge to the coach batteries, Aircraft Spruce, Jamestown Supply and other places have remote shunt ammeters.