Originally Posted by gccappy

All motors come with the heater installed. The cord is the $10. dollar option if purchased when the truck is ordered. Otherwise its $40. after the fact. The plug is located just behind the oil filter. The filter obscures the view. You have to crawl underneeth or remove the filter to see it clearly. It protrudes from the block about 3/4 of an inch and should have a threaded on plastic cap. Mine was red. There are two posts sticking out that you need to be careful of when installing the cord. Make sure you line up the holes in the cord with the post on the heater. Put a little dialectric grease on the connection and slide it together. Route your cord safely to somewhere convienient and tie wrap it. The engine wont get warm from the heater but it will keep the frost off and when you start it up in sub 30 degree temperature it wont sound like its full of marbles. I got my cord from Cummins NorthEast in Syracuse NY. for about $12. bucks. I have the exact part number at work if you need it. My truck is also an 04. so the number will be the same.