UPR LC
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I am looking at installing a Victron DC-DC charger that has a 12v voltage remote on-off. How would one detect that the engine is running? Or really the alternator. As opposed to power being supplied such as when the aux is on.
On my Redarc BCDC it needs a "vehicle on" wired input. I used an "ignition on" circuit to feed that sensing wire. This is on my F250 that has upfitter switches (switch is ignition on controlled).
Do you run AUX (engine off, power on) a lot? If not, I'm not sure it matters if your sensing circuit is engine on versus AUX on. If you do run a long time with AUX on, then you could always install a switch in your circuit to manually isolate the DC-DC sensing wire.