I have one that is factory on my Ranger and is tied into the same wiring as my block heater. I will say my truck cranks and starts like it's warm when it's plugged in, but I'm sure the block heater has a lot to do with that. I don't use it very much since I park my truck in the garage in the winter, and I don't have a place to plug it in at work, which is when it would actually do some good.
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