Engine block heaters are a way of life in this corner of the world. While unplugging the truck from the friendly extension cord I got a 60 cycle jiggle . . . thought it might be the cord. Two days later the heater went dead. Found a new block heater and cord at the dealer (cheaper than Cummins this time) and installed it - took less than 15 minutes. These are super easy to replace and they also give you a real good view of the internals of the engine - helps you see how your anti-freeze chemistry is doing.
If your engine heater starts tripping GFCI's - don't mess around - replace ASAP!
If your engine heater starts tripping GFCI's - don't mess around - replace ASAP!