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yes exactly, the tow will send 12v 40amps from the battery to the dc /dc charger. The charger will send the amps to the lithium batteries. The 7port from the tow vehicle does send 12v from most tow vehicle but its very low ams, think of it as a maintainer.
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Cougar 30Rls
Gmc 3500 Denali '14
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