OEM part, very easy to install.1) Locate the block heater on the engine, on my 2012 Ram 2500 it was just to the left of the Oil Filter when looking at the left side of the engine. It should have a black rubber cover over the connection.2) Remove the cover with a twisting motion.3) Snake the heater cord up from the bottom of the engine bay.4) Insert the connector and screw the fitting down. I got a pair of pliers up there and was able to snug it down nicely.5) Route the heater cord along the frame to the front bumper, there are holes for the plastic clips, very easy to see.5) Go around the radiator and to the right and above the left side tow hook there is a place with two holes for the clips to hold the plug end.I tested the set up and it heated the coolant to 127 degrees.