When I had my Dodge Cummins 1-ton truck, I had a block heater in it. I plugged it in at home or on the road whenever the temperature fell below +20 degrees. I used it when the temp was 30 degrees below zero F and it worked fine. Of course, you have to have a source of 110v power available.


On my truck, I installed an extension for the block heater out to a flip-cover connector on the front bumper. That way, I didn't even have to open the hood to plug it in.

1977 CJ-7, fiberglass body, AMC 360 w/ headers, DUI ignition, Edelbrock intake and Holley 4150 carb, TF999, Dana 300, 4.56 gears lockers, York air comp, 4" susp lift, 2" body lift, BFG 35" M-T tires, Megashifter, AGR pump & box, REP8000 winch.