After searching around for wiring info for the stock SVT sub and amp, and unable to find any usable info. I decided to make a small "how-to" for you guys.
Solder and shrink wrap wiring harness connections
Wrap wire loom around wire bundles (so it looks good)
Strip single RCA cable and twist core wire and shield wire like shown.
Solder "male" spade connector to blue/white wire.
Solder Blue/White wire to the White/Red wire.
Solder RCA core wire to the White/Black (+) wire.
Solder RCA Shield (negative) wire to the Grey/Black (-) wire.
Shrink wrap connections
Will update with more pics of the sub wiring harness later.
If anyone has any questions I will answer them as best I can.