Looking at the unit from the back, there are 16 pins. I will number from top left corner pin as #1 then pin directly under pin #1 will be pin 2 and so forth with #16 pin being the far right bottom pin. Pin #1 = White wire Front left pos speaker. #2 = White/black wire front left neg speaker. #3 = Green wire rear left + speaker. #4 Green black wire rear left neg speaker. #5 = violet rear right pos speaker. #6 violet black wire rear right neg speaker. #7 = gray wire front right pos speaker. #8 gray black wire front right neg speaker. #9 and #10 are blank. #11 = blue wire power antenna. #12 blank. #13 = red wire 12 volt pos switched. #14 blank. #15 = black wire 12 volt ground. #16 = yellow wire 12 volt pos always hot. I assume you should install a fuse in the yellow wire. Hope that helps you.