X2 on leave it on. The converter will charge your battery but if you do not have a plugin where you store it remember to turn it off. Mine stays plugged in all summer and i check the water level in the battery about every 2 or 4 months.
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2009 Seville VF32KS
2019 GMC Sierra 3500HD Crew Cab Denali.
6.6 Diesel standard box.