How do I charge my batteries with the ProSport charger?
Plug in your heavily duty U.L. approved extension cord to the ProSport charger first, then plug it into a nearby 120VAC GFCI protected outlet. Observe both green (AC Power) and red (Charging) LEDs as they indicate charging is occurring. The system will automatically manage charging and maintenance modes (Page 9).
From the official Promariner Pro Sport 20 Plus manual, page 9
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