Pre amp location

[Kareem Whitaker]

I have a 2006 expedition eb and the radio plays while vehicle is not running but when vehicle is started, the radio sound disappears. Got diagnosis it’s the radio, bought 2 different oem factory decks, same results. So now got a diagnosis that it might be the preamp. Anyone know the location of this amp?

 

[Trainmaster]

The parts books show different locations and not all vehicles had them. They are behind the radio/heater controls or under the console.

 

[Kareem Whitaker]

Any idea what it looks like

 

[RichardH]

 

[Kareem Whitaker]

Is pre-amp the actual name. Is their a part number or should I be able to find one looking up that serial number on this one

 

[RichardH]

Is pre-amp the actual name. Is their a part number or should I be able to find one looking up that serial number on this one

Ford Expedition AMP # 3W1T18C808AD