If you have the cord it will be behind the passenger tow hook. If you need to install one you can get it from any truck dealer, farm store or off ebay. Just order the one for the dodge Cummins. It is the same cord used in everything from Detroit Diesels to the Dodge Cummins to some of the John Deer tractors. Here is a link to install it although i would put it into a wire loom. Walmart has 3/8in loom that works nicely.
Diesel Technician Society
Easy install, i did the one on my 6.4 and it took less then 10min.
