The solenoid on my coach has 3 functions , connects the battery banks together , 1- when engine is running; alternator charging ; , 2- when the coach is on shore power ; converter charging , 3- battery boost.
So any time the engine is running or the coach is on shore power the solenoid is powered up and hot ( ish).
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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