I've got the same issue on my '05 H2. The right front. I unplugged it and moved it to the left side to see if the dimness followed the lamp, and it's the lamp itself (in my case). Try that first just to be sure you aren't experiencing low voltage to the lamp. If so, you'll probably just have to bite the bullet and replace it. I plan to wait until mine is completely out, because they're going for around $120 on eBay right now, and mine still puts out some light.