I have a few questions. I have a 2003 F150 and I want to expand my sound system. I do not have RCA jacks, but there is a port on there, I don't know if it is to add stuff to it or what. Take a look at the pics and tell me what you think, or if you know.

Model # 3L3T-18C815-CA

The port with the 3 rows of metal prongs is the port in question (port on left). I have no clue what goes there. If you know anything, let me know please.

http://i55.photobucket.com/albums/g1...04-06_1347.jpg (port zoomed)
http://i55.photobucket.com/albums/g1...04-06_1346.jpg (front)
http://i55.photobucket.com/albums/g1...04-06_1345.jpg (port)

Thanks in advance..

Dan