For some reason my right front low beam headlight wont work, high beam, park light etc... all work fine. What could be wrong? I put a new bulb in to and still nothing.....please help.

 

Ok, this is from the manual and will explain a little how the lights work.
HEADLAMP SYSTEM
The instrument cluster monitors both the multiplexed
headlamp and multifunction switches. The
instrument cluster transmits a J1850 bus message to
the front control module (FCM) to activate the headlamps.
The FCM will respond
by activating the appropriate relay in the Power Distribution
Center.
Using the multifunction switch (turn signal) you should be able to test the entire headlight system by operating the optical horn (first detent), this turns on both hi and lo headlights. I suspect you will have what you stated a rt lo beam fail to light. Pull the appropiate relays in the IPM to clean and swap. Retest and determine if you have a bad relay. I think cleaning will solve the problem, if not a new relay should.
Good luck...

 

where is the relay located? is it in the fuse box under the hood? and how is it labled, i didnt see a headlight fuse or relay.....

 

Yep, inside the IPM (fuse box) in the bottom of the lid should be a layout of the fuses/relays.

 

correct, but i dont see one that says headlights......... ?????????

 

Maybe I got it wrong, but the manual specifically mentions relay. It is hard to follow,and I'm away from my truck so I can't run out to it and check. The FCM sends the signal to the IPM to turn on the headlights individually, LF Hi, LF Lo, RT Hi, Rt Lo. I assumed from reading the manual it used relays the same as for the fog lights. If there are no relays for the headlights than I suggest checking the IPM headlight outputs. If you find a faulty IPM output and no apparent cause. then you will need to use a DRB III scanner to diagnose the problem, sorry..