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You could measure resistance at the plug. Call the dealer & ask what the resistance levels should be through the heater. It your plug reads infinite or zero Ohms I would say you have a problem. I have a heater for my suburban I have yet to install. I will measure resistance across heater & heater & cord & let you know tomorrow.
My heaters have a cord that just presses on. If you can feel the cord on the block end you can probably replace it without seeing it.
I have tried to leave the driveway twice while still plugged in. The first was the morning after my 6 yr old daughter asked me if I ever forgot to unplug it to which I truthfully replied "no".
1st time - I stopped in time.
2nd time - cord knotted up in the garage & broke the door on its way out.
I used to just put a loop in the extension cord & put around a tow hook.
Now I tie a loop in short extension cord & put it around a tow hook on the front bumper. Then I plug my long extension cord into the short one. It may screw up an extension cord but will not screw up my heater. The last thing I need is antifreeze pouring out of the block at 6:30 am. You could tie a cord around a tow point by your front bumper.
An LED sign that says "BLOCK HEATER" that is on when the heater is plugged in may be in my future too.
Don
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