i have a 2013 chevy 1 ton dually, doesel of course. after plugging in my block heater over night, it seemed hard to start. up untill now everything seemen fine. i do have 120 volts at my plug in.
Yep. How many times have I seen extension cords stretched across the parking lot? LOL. They do quit, the element gets covered with deposits from the cooling system or simply burns out. Is yours in the block or a heater hose? The latter will airlock and the heater fails.