Easy to test. Disconnect the chassis battery negative terminal and ground wire (simulating a dead battery), press and hold the Emergency Start switch and try and start the engine. If the dash gauges all cycle when you turn the key to run good probability everything is OK but try and start the engine to give the circuit a high power demand test. No start you'll need to dig deeper. Could be the solenoid or could be something else.
Amp loading in the range of 2 or 7 milliamps (could also be written as .002 and .007 amps) could be anything from radio memory, engine ECO memory, a slight ground in an engine sensor to even a false reading on a basic multimeter. In other words it's very, very small.
And lastly, go here -
https://www.thormotorcoach.com/owner-resource/ and first create an account then register your Ace. Thor will then build you a package that is specific to your coach regarding all the systems installed. Attached is an example for a 2018 model year coach and on page 13 it shows the solenoid for cross connecting the battery banks.
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