I think these guys are confusing you more than helping you.

Simply put:

Use the wire taps. Tap into the head unit's switched power source and ground. Then, wrap the wire taps with some electrical tape.

1999 Ford Contour SVT #900/2760 (SOLD) 2005 Mazda 6s 2003.5 Mazdaspeed Protege 1998 Ford Ranger 4x4