The remote turn on wire usually comes from the radio in which case your amplifier wont turn on if the radio isnt on. This is to signal external components such as amplifiers or power antenae to.

Step By Step Instructions For Wiring An Amplifier In Your Car
Where does the remote wire go for my amp. Well the remote wire is what runs from the back of the deck to the amp and that wire sends a signal telling the amp to turn on and off. The remote wire is for powering on the amp. The turn on wire also called the remote wire is located behind the stereo. On aftermarket stereos its usually a blue and white wire. You can connect a wire. When the amplifier senses this voltage it turns the amplifier on.
If the remote turn on wire doesnt have power your amp wont turn on. If you supply it with any 12v the amp should work. Tap the rem wire into the headunit power source. Use your wire hanger to slide the power cable through the hole that you made. It does need to be wired correctly. Open your passenger side door and find the wire from inside.
If you cant find a remote wire from the hu you can use a switch. The remote wire coming out of your car stereo constantly sends a low voltage signal while the stereo is turned on. Slide your power wire through the firewall with the coat hanger. Slide the wire through until you reach the glovebox or the opening underneath your glovebox where your wires feed into your vehicles interior. The remote wire acts essentially like your finger flicking a switch where your finger is battery power and the switch is a mechanism inside the amplifier. Youll have to remove the stereo to get to this wire.
The remote turn on wire receives voltage from the factory electrical system when the ignition is in the accessory or on position keep reading this document for the complete explanation. Go to lowes buy little blue tap in connectors they are great. You might want to recheck how you connected up your stereos harness. This voltage is transferred through the remote turn on wire to the amplifier turn on circuit. All the remoterem wire does is sense if the car is on therefore you need to run the wire to a 12v power source. If there is only one blue wire then what id do is connect up the amps remote turn on wire to the stereos switched ignition wire yellow on the gm harness red on the stereos harness and run it through a switch so you can kill it when you turn the stereo off.
The remote wire will tell your amplifier to turn on whenever the stereo is powered up usually whenever the vehicle is turned on. To wire a switch to your amp you need wire the 12 connection on your amp to the remote on your amp. Posted on monday august 04 2003 2138 gmt.