My search-fu is weak, so I went through the entire 139 pages of threads in this lighting forum...

I am the proud new owner of a 2004 Blazer 4-door. I have noticed the factory fogs jiggle when the vehicle is moving. How are these things held in? Is there some way to tighten them?

 

Are yours next to the turn signal or in the lower bumper

 

Next to the turn signal.

 

The fog bulb is a twist in. Check that they are inserted properly. Otherwise the hosing themselves are popped with plastic tabs. Check that those are all in place, if they are chances are they've worn out and aren't holding firm any more.

I'd suggest a dab of jb weld to stabilize them. Unless anyone else has a fix that has worked for them on this.

 

The problem appears to be the housings. I will take it apart next weekend... In the mean time, I am interested in any and all suggestions that may help.