Welcome to the forum.
Sorry, Not owning a Montana, I'd bet someone that does will be through soon.
I'd venture a guess it's pretty close to the batteries, or should be. You might trace the cables from the batteries to the inverter / converter /charger.
Be well.
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J & J, DRV Suites ES-38RSSA #9679 GM Denali, 3500HD-Max, 4x CC, 8' DRW,
EZGo-TXT, Clubcar Precedent
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