I agree with Beaufort NC that it must be the boost start. If your chassis batteries get weak, press that button for a couple of seconds, while holding it down try to crank the engine. If it is the house battery boost it should help you get the engine started.
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2002 Gulf Stream Scenic Cruiser
2018 Buick Envision Essence
Neway Freightliner chassis
Aventa II Blue Ox
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