Here is what I have, very easy to mount and simple solution.

BLOCK HEATER BUMPER PLUG ('03-'09)-Dodge Cummins Diesel Truck Accessories Geno? Garage

 

Looks good

 

Been reading post on site for several days, and had to join up. I've read many post about 2003 dodge diesels with the very same problem as mine. My truck only starts after being slugged in to block heater, once started runs great, and will start the rest of the day. Hard to believe I need $3000-$4000 for injectors. I've replaced the crankshaft sensor, batteries are good. the code p0633 pops up when turning key off and on 3 times. Can anybody point me in the right direction? or let me know where to go on this site to find more information.