Have a 2004 Lariat with Audiophile subwoofer. I am putting a new head unit in and need to connect the subwoofer leads. There are four leads. Does anyone know what the purposes of each lead is, or tell me where I can find a wiring diagram?

Thanks

 

4 leads out of the head unit, or 4 leads coming off the sub? Is the sub a dual voice coil or single?

 

There are four leads coming from the HU and there are four leads going to the sub.
The HU has two for input and two for power, but I don't know which is which to the sub.
Not sure about the sub, it is the standard sub that you get with the Ford Audiophile system.