Guys so I know that there's a 520 page thread on this but needed help quickly.

I've installed and wired up my Anzo's identically but the passenger side is working on driver's side switchback function is not. I have rechecked the wiring, plugs in high beam cavity - everything I can think of and no idea what else to do here. My truck is still in pieces until I can figure this out. Has anyone had this issue with one of the switchbacks not working??

 

Are you using a wiretap for the connection to the turn signal? Could be a bad connection there, I had that issue with mine and had to redo one of them. Also might not be a bad idea to run wires from the switchback light directly to the battery just to verify that the light is functioning.

 

I had the exact same issue. Pulled the wires out of the tap and tried again, then everything worked. Sometimes its to subtle to see but never hurts to try again. Had me nervous for a second though.