[jacobg98]

I noticed that as well when putting in new headlight housing and switching to LED. Badland Industries has a YouTube video explaining a number of light-related mods on these trucks, and making both running lights flash with the turn signal is one of them. It does require a new socket (one w/ four wires), but I think they should have come from the factory that way.

 

[jacobg98]

Badland Industries has a youtube video (link below) talking about various light mods. This is one of them. I believe it uses the same bulb and socket, you just need a socket with another wire to tap into the other turn signal. I believe he has a link to what he uses in the description of his video.