I use the Coleman 40 qt iceless cooler and it does have a plug. My friend that works at Schneider has the same one and he unplugs it at night so it doesn't kill the batteries. I have the autostart feature on my truck so I never unplug mine.
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Thanks Tractor Man, is that a 12 volt cooler and if so can you keep it plugged in with the truck off or will it kill the battery?