Aftermarket HU to factory sub

[Builderdad]

Trying to hook up a new HU but can not find anyone that knows how to wire to the factory sub and amp. 02 with the Mach 6 disc.
There are 4 wires from the radio to the sub amp. a red,blue,brown and bare. Red has 6 volts to ground. Any help?

 

[Brian's98XLT]

You will probably need a adaptor to do that. I would recommend www.soundgate.com
Give there tech a call and they might be able to help you a give you a number to a dealer that might have the part yopu need.