DRL Resistor Location and Pictures

This is where the resistor is if DRL is installed.  If not you will just have a cap on the wire harness.
The blue arrow points to it's location.  

If you lay on your back with your feet out the front of the truck you can look under the left side and see the wiring harness for the DRL Resistor (This photo is taken from that view).   The Blue arrow points to the DRL Resistor (Cap shown on mine).   The Green arrow shows the wiring harness going to the left headlamp.  The Red arrow shows the wiring harness going somewhere else (Never had the time to follow it).  The Yellow arrow shows the Fog Lamp harness.