So the other night when i went to plug the truck in, right as the plug was just about plugged in all the way it made a POP and there was sparks right at the plug. I just left it alone and plugged in over the night. In the morning the coolant was only 9°, so obviously its not working. What happened? What should i look for?

And no, a braker didnt trip in the shed, that was the first thing i looked at.

Although no breaker tripped, check the block heater wire. I've had to replace it twice...not the highest quality I guess. 5 min job at worst.

The cords usually fail out towards the plug. Cut off about 6 inches of cord and then install a new plug end. If you have a meter, you can then check for continuity.