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I cam out one morning abd the truck was BUZZING, then when I unplugged it, the BUZZING went away.
The engine was warmed by it, and the wire was no hotter than usual, but the temp outside was warmer than I had expected, and the heater would not have been needed at all.
The fear of the fire department waking us up in the middle of the night to let me know they had put out my burnign truck had prevented me from using it again, and tomorrow I will be needing it if I want an easy start.
my ears ain't what they used to be either, but i hear my block heater whether it's 18 degrees or 90 degrees, so don't think you have a worry, just means it's working.