If you have access to an ohm meter you can check resistance of the two flat pins. You typically see around 15-17 ohms of resistance on good plug. This will check the plug and the element. If your reading is high unplug it from the element and clean connections, this will usually bring the resistance into the correct range. High resistance will indicate damaged cord, plug or element. Also if you can check resistance wiggle the plug if the reading jumps around the plug is junk. You can get a replacement plug from Home Depot for 6 bucks. One more think an easy way to verify if it works, plug in the block heater on a cold engine for a couple of hours, then reach in and touch the block. It should begin to get warm. After an overnight soak with the block heater plugged in I usually see around 70-80 degrees coolant temp. Good luck
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