Join Date: May 2013
Location: Woodstock, IL
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Per the Cummins diesel supplement:
"Block Heater Usage
For ambient temperatures below 0°F (-18°C), engine block heater usage is recommended.
For ambient temperatures below –20°F (-29°C), engine block heater usage is required."
If you plug in, the water temps inside the engine will not drop below 70F, and you oil will be warm as well. Which means when you start up, it's like starting a warm engine, and you get cabin heat faster. Nicer for your engine, but plugging in and unplugging a frozen and maybe snow covered electrical cord takes common sense. Use an outdoor rated extension cord and plug in to a GFI plug, and unplug from the dry inside source first, not the truck first.
Just also note, the 2019's have a built in 3 phase ceramic cabin heater, that will start to give you cabin heat in 2 minutes. Within 5 minutes, you are comfy.
So far I have not plugged in my truck other than to test the system to verify functionality. Even below the 0F.
And the plug is hidden under the front license plate area.
2019 RAM 2500 Laramie CTD, Crew Cab, 4X4 all options except rear air susp, Black Forest Green Pearl.