These bulbs made a big difference in the sidefill which is non-existent in the 2500hd with the stock headlights and halogen bulbs. I can now see pedestrians at the sides in dark areas and I'm not getting flashed by oncoming traffic. I've seen another review mention they aren't bright enough. It's important to remember fog lights are not designed to be overwhelmingly bright, rather diffused. If you want something really bright you need to do a complete change-out because a LED bulb upgrade isn't going to work in the stock fixture. I really like the amber switching option. I anticipate they will rock when I need them for snow and fog.
There isn't a lot of installation information available for my vehicle. Let me help you:
It is best to pull the fog light fixtures out from the front of the bumper. It's easier than you think, and absolutely easier than working from the back. Both sides are essentially the same, but the passenger side will require a little trimming of a metal support frame behind the bulb/fixture. Do the driver's side first to give you some familiarity before doing the additional work on the passenger side. Everything is snap-in.
1. Remove the trim ring around the lamp by squeezing the four retaining clips at the rear of the ring. A little pressing, distorting and pulling on the ring should do the job, but I also used a thin flathead screwdriver from the rear under the bumper to help work the clips free. It should only take a minute or two.
2. To remove the fog light fixture is going to make you queasy. There are two mounting posts at the top and one at the bottom. The one at the bottom has a star wheel for adjusting the lamp up and down. As long as you don't move that wheel no readjustment should be necessary. Gently pull the bottom of the bulb forward until it 'Pops' out of its retaining cup. You can use a long screwdriver to provide a little leverage from behind, but of course be careful. The same goes for the top ones, but focus on only one post at a time, and I recommend doing the outer post first. That's it ' it's free!! I suggest using a little WD-40 on the posts when reinstalling to help them pop back in.
3. The bulbs are a little sticky to work off (I've read this from others as well). Just be patient and rock them out slowly while pressing on the release tabs. Honestly, the old bulbs are such crap I broke a tab off the bulb and tossed them away anyways. Just don't damage the fixture.
4. When installing the new bulbs there are some guide pins to match up before pressing in the new elements. I also found it helpful to clean the channel where the bulb O-Ring rests by using a Q-Tip with a little WD-40 to clean the channel on the fixture. Then wipe off any excess with a clean Q-Tip. Do not allow any WD-40 to get into the fixture. When pressing in the new element slightly rock it in until the snaps engage on each side of the element.
5. Hook up the power connector (being mindful that you will need to secure any excess wire ' see below). Test it to make sure it lights up. Then press everything back in to the bumper. You should secure the in-line power-driver to the frame. I used a zip-tie and secured the driver itself to the frame.
For the passenger side you will need to cut away a small corner of subframe that will hit the back edge of the bulb. This will likely affect any aftermarket LED bulb; not just this one. You can use a Dremmel with a cutting wheel to reach through the open hole where the fixture was removed to get the major cutting done, then smooth off any sharp edges by changing to a stone grinding wheel. You will need to remove about 1/2' deep and 1' wide, and none of it serves any structural purpose. I found it simplest to cut it out at a diagonal rather than squared off. I suggest using a little touch up paint or nail polish of any color to protect the raw metal from rust. Sparkles in the paint add a nice touch.