I have a 2010 f 150 STX with factory radio and it just stop working one day going do the road .I have replace the head and the ACM .Everything works you just don't have any volume .You can put a CD in and it is playing but there is no sound .I have been over all fuse's 3 or 4 times. Have checked the wiring at the doors. Is there a amplifier outside the radio and if so where is it located I need Help!