[cart7881]

Welcome to the Nation.

I think that you are the first to ever ask about that. I don't know the reason for it, but there are only two wires to the socket, so my guess is that only one filament is used.

 

[cart7881]

Yeah, we've been getting a lot of trash here lately. Notice that they just joined.

 

[cart7881]

There are only two wires to the socket, one power and one ground. How do they switch power to the second element in the bulb?

 

[cart7881]

You have a 2005. Aren't your DRLs the parking lights, not the headlights?