To find this wire, you'll need to:
* Consult a wiring diagram: A wiring diagram specific to your Grand Am's year and model is crucial. These are often available online through repair manual websites (like Haynes or Chilton) or automotive forums dedicated to Pontiac vehicles.
* Trace the wires: If you can't find a diagram, carefully trace the wires from the amplifier back towards the head unit or fuse box. Look for a wire that's connected to a switched 12V source (meaning it only has power when the ignition is on). This is your turn-on wire. Using a multimeter will help confirm.
Don't rely on generalized color codes; always confirm with a wiring diagram or by testing the wires with a multimeter.
