Copy/Pasted from my thread on another site.
you DONT have to remove the batteries, but it sure does make things simpler lol I did mine without removing the batteries, just to see if I could.
First off. Place a peice of cardboard, or something you can mark on about 20-25 feet infront of the truck, and mark where your headlights are shining onto it, for reference later.
Now, onto the fun!
Open the hood, and using the Phillips screwdriver, remove the (4) screws ontop of the grille, and one in the center bottom of the grille, lift up and out to remove, set aside.
Next order of business, is to remove the two screws ontop of each headlight bucket, above the headlight. Now on the backside of the headlights and signal lights, between the battery, and core support are two 11mm nuts that need to be removed. They are on the backside of the turn signal light, under the headlight.
One hole is to the right side of the bulb opening (as shown above), and the other hole is in the corner to the left, they are a little tight to get to, and if need be, you can remove the battery to get better access to the holes, using a 5/16" socket.
After removing the two 11mm nuts, and two screws, the bucket will remove with the marker light, and turn signal attached. Becareful removing them, the bulb wires are sometimes short, and can be easily ripped out. Repeat on other side.
Now we will be changing the marker and signal lights. Using an 11mm socket and 3/8"ratchet remove the bolts shown here.
This will remove the marker light from the bucket, reinstall the new one the same way with the metal bracket in the same place.
Now remove the three phillips screws from the turn signal light, they are shown here.
Removing these screws will remove the turn signal light from the headlight bucket, reinstall the new light with the same screws.
Next we will be removing the header panel, with headlights attached. Unplug the headlight bulbs from the truck, and if memory serves me right, there are 11-12 5/16" bolts that need to be removed to remove the header panel. I have taken photo's to show them.
After removing all the bolts, place a few towels down to protect your factory lights, and place the header panel face down on the towels.
You should now have your truck looking like this...
Back to the header panel, using an awl, or pick and flat head screwdriver, pry the clips holding the headlight adjusters in place off, be gentile, as you will be reusing these clips!
Take your new headlights, compare the old headlight adjusters to your new headlights adjusters and try to get them close, then, using the old clips, install the new lights into the headerpanel. Next put the headerpanel back onto the truck.
Make sure all your wires are not pinched, and that they are all in the right locations, and change the clear bulbs to the amber bulbs. (I took this opportunity, and replaced them all, the marker lights can be VERY hard to change once installed) Now you can take your headlight bucket, with newly installed lights, and place it back on the truck using your old hardware, reinstall the grille, and your almost done!
Now, using your cardboard, with the headlight markings, adjust your new lights to about where your old ones were. I reccomend going to a garage, and having them aligned properly.
Close the hood up, and admire!