Here ya go, always verify with a multimeter your powers and ground, also if you have a AA batterie you can pop each speaker so you know you got them right. Meaning you can out your + speaker wire one on side and - on the other side of the batterie and it will push the cone/pull the cone depending on how you hooked it up. If that doesn't work it may be amplified but i highly doubt it.
1988-91 Pontiac Grand Prix Stereo Wiring
Constant 12V+ Orange
Switched 12V+ Yellow
Ground Black
Illumination Gray
Dimmer Brown
Antenna Trigger Pink
Antenna Right Rear
Front Speakers 4" x 6" Dash
Left Front (+) Tan
Left Front (-) Gray
Right Front (+) Light Green
Right Front (-) Dark Green
Rear Speakers 6" x 9" Rear Deck
Left Rear (+) Brown
Left Rear (-) Yellow
Right Rear (+) Dark Blue
Right Rear (-) Light Blue
brandon
