Bypassing the preamp in a 95' mustang

[rstueve]

I am instanlling a after market stereo into my car, and I was wondering where the bypass modulator is on a 95' mustang, and I was wondering how to disconnect the preamp, or bypass it some way to get my factory speakers to work. I have tried every possible combination with the speaker wires, and I do not want to run all new wires. I was hoping i could just disconnect the preamp some how to get the regular amp in my cd player to push my factory speakers. I would like to know where the bypass modulator is at, and how to disconnect the preamp or bypass it. Thank you,

Rodney