The signal to turn on the amplifier comes from the head unit (radio). This is usually done through a remote turn-on wire which is a low-level signal wire, not a high-current power wire.
To find this wire, you'll need to:
* Consult a wiring diagram: This is the most reliable method. You can often find wiring diagrams online through forums dedicated to Chrysler Pacificas or by purchasing a service manual. The diagram will show which wire from the head unit provides the remote turn-on signal to the amplifier (often labeled as "amp turn-on," "remote," or a similar designation). The color of the wire will vary depending on the year and model of your Pacifica.
* Use a multimeter: If you can't find a wiring diagram, you can carefully test wires coming from the head unit while the radio is turned on and off. Look for a wire that changes state (voltage) when the radio is switched on. Be extremely cautious when working with car electrical systems. Incorrect wiring can damage your vehicle's electrical system.
* Check the amplifier's wiring harness: Some amplifiers might have this wire clearly labeled on the harness itself.
Important Safety Note: Working with car audio wiring can be dangerous. If you're not comfortable with automotive electrical systems, it's best to take your Pacifica to a qualified car audio installer. Improper wiring can lead to electrical shorts, fire hazards, or damage to your vehicle's electronics.
