I have the factory head unit in my AU3 ute and it only has speakers in the doors. I want to install speakers below the side windows in the ute too but was wondering how I would go about wiring them up? I'm guessing there would be no wiring for a second set of speakers.
This is the head unit I have in my ute...

The speakers you are referring to are optional for Utes, maybe there is a wire there?

Cheers George. I might have to take the lining off and take a look.