06 ranger radio need help

[Raw16057]

Hello, i have a 06 ranger 4x4 xlt 4door truck with an am fm single cd player. My problem is the radio only has sound when the key is on . after starting there is no sound. It also does not work in the accsesory position, only when the key is on. This just started today. It seems like there is a seperate amp that does not power up once started. Any help would be welcome.also when there is no sound the radio seems to work correctly tunes stations, lights on, cd shows , and volume looks like it goes up but no sound.

 

[cvar]

See http://www.therangerstation.com/tech_library/radio_wiring_diagrams.html

The HOT-IN-START wire going to pin 3 is effectively a "mute" while you're in the midst of starting your vehicle. Is that pin getting power when it shouldn't? Time to use your electrical multi-meter.

 

[carbuff]

So all of the other normal stuff works in acc mode? Its just the radio not getting sound but working otherwise? Sounds like its the amp not getting juice, as you said. I dont know where the amp is located in that vehicle but I would pull the input plug on it and check the power lead for power in acc mode.