the Mach system has an amplifier I beleive - you should run new wires to bypass it... this is off 12volt - The speaker wires colors probably don't match up(and will not sound good even if they do)


1998 Ford Mustang Stereo Information Constant
12V+ Green/Yellow
Switched 12V+ Yellow/Black
Ground Black/Green
Illumination Light Blue/Red
Dimmer n/a
Amplifier Remote Blue
Antenna Right
Front Front Speakers 5" x 7"
Doors Left Front (+) Orange/Light Green
Left Front (-) Light Blue/White
Right Front (+) White/Light Green
Right Front (-) Dark Green/Orange
Rear Speakers 5" x 7" Rear Deck
Left Rear (+) Gray/Light Blue
Left Rear (-) Tan/Yellow
Right Rear (+) Orange/Red
Right Rear (-) Brown/Pink