When I bought my truck it already had a JVC KD-G300 head unit and a 6 cd changer behind the seat. The cd changer is not hooked up so I was wondering if anyone could tell me how to do it.

 

pull the head unit out and there should be a plug in for the changer conector. just chase the wire from the back of the changer and plug it into the headunit.

if not they might have used an adapter that went through the radio, via a set radio station.

 

Yeah I've taken it out before and the plug for the cd changer is there, but I don't see a place to plug it into the head unit