Where is the flasher for 2004 GMC Yukon?

Answer 1

I found the flasher under the dash on the drivers side directly above the left foot area. It is very difficult to remove and even more difficult to install. I removed the flasher with a long flat tip screw driver. I installed the new flasher with two long necked socket hand drivers using the drivers to position the flasher then prying with the drivers to set the flasher in place. Good luck!!