2005 Ford F450

[wlsmithjr1960]

My F450 Radio wont work, all the fuses are okay has power going to it and the only thing that works on the radio is when you press menu the clock will light up for about 10 seconds. Took the radio out and plugged it into my f250 and it worked, anybody with any ideas on what I can check next? Thanks: wlsmithjr1960http://www.powerstroke.org/forum/images/smilies/dunno.gif