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, it may have died. FWIW, a long time diesel mechanic told me that starting the eng with the heater running seems to kill them (not always). The one I helped a guy replace was subjected to that treatment on a regular basis. Not trying to get into a argument here. Just pointing out a trend noticed by a top notch mechanic.