I have just recently bought a JVC KWR500 radio for my 08 F-250 so that I can have bluetooth capabilities through while driving. I bought the radio at Bestbuy and bought all the installation parts with it i.e. the wiring harness so I do not cut apart the factory wiring, antenna adapter, and the mounting adapter to fill in the factory opening in the dash. My question is there are two plugs in the back of the factory radio, one being a 24 pin and the being a 16-pin plug, what exactly is the 16-pin plug for? I was told it was for the factory amp and sub but the wiring harness I bought at best buy had an 8-pin plug for the amp. I also talked to a geek squad installer there and he said that they couldn’t get an adapter for this plug. What is everybody else doing when installing a different radio? On the other hand, is this plug all that nessicary; I am eventually going to install two subs and an amp behind the back seat but maybe sooner than I thought.