Power converter to plug truck in in the winter?

[JoshH]

Dunno if youve used it much on anything that pulls much juice, but the ground on that little jumper doesnt work worth a pinch of $hit. Not one of our 4 duramaxs will jumpstart a tractor or a truck off of that stupid thing, but if you connect to the battery ground and that positive terminal, viola! Cranks right up.

I always clamp the ground clamp of jumper cables to the spot on the accessory mounting bracket where the second alternator would normally go.

 

[Bryce418]

I use the block heater on my truck all winter but, not because I'm concerned about it not starting. I just don't like sitting in a cold truck any longer than I have to.