Recently bought a 2004 Trailblazer LS. I am looking to get the fog lamps installed. I found the fog lamps but can't seem to find the wiring, switch and relays. Any ideas where I might locate them?

Check the fuse box underneath the hood for the switch for the fog lights. :smokin:

Are you saying that the TB is prewired even as an LS? The dealer suggested that to me and all I would need is to buy a new light/fog lamp switch for the interior for 82.00

I'm not necessarily saying the LS is prewired for non-existent foglamps. In fact, I don't even know about that for the LS. I own an LT. :D But I do know that all electric work goes through the fuse box. :)

I own a 2004 LS and mine does have fog lamps on it. I do believe that it pre-wired for fog lamps but you will need to buy the switch that is located next to the head lights controls. I do believe that you will need to cut out the holes in the valance as they are covered by plastic but I could be wrong about that.

You could try checking with gmpartsdirect.com That is where
I got my GM Factory Lights For my Silverado Came with Lights
Wiring Harness Relay and New Switch, The Wiring for the switch
Was Already There Behind The Dash