Yea I kinda get that
Why I am asking is that I replaced the basic as they get radio with the new one (cd mp3) from a different truck.
I know that it supports direct line in via the 20 pin port on the radio, I just do not know which ones are used.
If no one knows here I have two options, 1) pull the radio and do some internal digging or 2) find the time to go to a scrap yard and ohm out the pins via the lin in jack.
It would appear that not too many people know much about the 20 pin connector.