Here's how to find the correct wire:
1. Consult your stereo's wiring diagram: This is the most reliable method. The diagram will show which wire is the remote turn-on. It's often labeled "Remote," "Rem," "12V Remote," or something similar. Look for the color code associated with that wire. The diagram might be found:
* On the stereo itself: Sometimes printed on a sticker on the back.
* In the owner's manual for the stereo: If you have the original manual.
* Online: Search for "[Your Stereo Model Number] wiring diagram."
2. Test the wires: If you can't find the diagram, you'll have to test the wires with a multimeter. Disconnect the negative terminal of your car battery first for safety. This is crucial to avoid shorts. Then:
* Turn the ignition on: With the multimeter set to DC voltage, check for 12 volts on the various wires that are connected to the back of the radio harness.
* Look for a wire that provides 12V only when the ignition is on. This is likely your remote turn-on wire. A wire that always has 12V regardless of ignition is probably the constant power.
3. Common colors (but not guaranteed): While colors vary, some common wire colors for the remote turn-on are blue/white, blue, or light blue. Do not rely solely on color; always confirm with a wiring diagram or by testing.
4. Harness adapter: If you're using a wiring harness adapter, it will likely have the remote wire clearly labeled.
Important Safety Note: Working with car electronics requires caution. Always disconnect the negative battery terminal before starting any work. Improper connections can damage your car's electrical system or cause a fire. If you're unsure about any step, consult a professional car audio installer.
