changing out radio with new one

[83gl1100nb]

does anyone have any wiring help on what to do to change out the old radio/cb module with a new radio? the speakers work, but i can't tune the radio into get any stations, so thought i'd change to something newer. if i knew which wires went to the speakers, i could wire in a new one. there's that small multi pin connector behind the locking radio/cb, but i don't know what wires go to what. thanks for any help.

[Wilcoy02]

gray goes to right speaker.
white goes to left speaker.

Sierra electronics have told me that the tuners need adjusted to get the stations to be rec'd from time to time.

[83gl1100nb]

thanks, i'll see if i can locate them down in there.