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If it won’t be driven I’d see no reason too. If it’s REALLY cold when you return I’d plug it in for 5 or 6 hours before you start it, but even then it’s probably not necessary.
Phillip, are you talking about connecting the battery to a battery tender or are you talking about the engine block heater? I'm assuming you mean the former. "Plugging in" is a bit vague.
My F-350 sits for at least a couple of weeks between times that I drive it. I haven't had any problems.
Unless you are expecting -50 deg weather, I wouldn't plug in either the battery or the block heater. My truck frequently sits for a month at a time and more, no problems whatsoever.
I would not plug in the block heater until you get back, waste of power/money. It is only for extreme cold. Modern diesels are nothing like the old school diesels, these 6.7L will start well below zero without the heater. Having said that, I like to plug mine in when the temps drop below freezing, it makes it easier on the starter/batteries/engine, and the cab heater is warm!
I would not plug in the block heater until you get back, waste of power/money. It is only for extreme cold. Modern diesels are nothing like the old school diesels, these 6.7L will start well below zero without the heater. Having said that, I like to plug mine in when the temps drop below freezing, it makes it easier on the starter/batteries/engine, and the cab heater is warm!
2nd this,owned diesel since 89,I always plug in below 40.Easy on the truck and me. Three hours on a timer.