Originally Posted by smash_lizard
Well I'll be darned. I thought block heaters were only found on diesels. Must be a northern thing.
It's a part of the "Cold Weather Package," an option allegedly only available in "cold weather states." The package consists of an electric battery warmer pad which wraps around the sides of the battery, and a block heater, which is inserted through a freeze plug into the engine block. Both are connected to the three-prong plug that pokes out through the grille.
If you park the truck outdoors, and you live in a "cold weather state" (Montana, Wyoming, N&S Dakota, Minnesota, Wisconsin, Michigan, or New York and perhaps a few others) the truck will start easier and deliver heat a lot sooner if you plug the cord into a 120 volt outlet overnight.