2000 f150 radio aftermarket holds no memory

So I gave working on the alarm a break so i can work on the radio to get some music so i won't go nuts. I found an issue with the fuse box and got the radio to turn on, setup my station and shut her down while i go about and setting up the door, i turn her back on and my radio re-set the clock and my station back to static. I did a couple shut down and it still won't hold memory. I double check my power connection -------------------------------------------------------- constant power 12v(+) - lt. GREEN/ purple switch power 12v(+) - BLACK/ purple Ground - BLACK/ green -------------------------------------------------------- Looking through the audio wiring diagram for the 2000 ford f150 I was suppose to have a lt. GREEN/ pink wire for constant power but mine a ltGREEN/ purple wire. I am wondering if I have my power wire backwards Am I suppose to set my yellow wire to the lt. GREEN/ purple (con. power) wire and red wire to the BLACK/ purple (switchable power)..

yep, i was right..I had the con. power on the main power and switch on standby. I reverse the wiring now i got memory