If the blue remote wire is connected to a constant source, the car amplifier will always be powered on. Now a car amplifier is an heavy load on an car battery, so it will drain your car battery pretty quick in comparison to leaving your cig socket charger plugged in all night. To fix the car amp draining problem, you will need to identified the correct wire to attach the blue remote wire too.
On an aftermarket radio such as pioneer, kenwood, jvc, alpine or sony, there will be an dedicated remote turn on wire just made for adding an aftermarket car audio amplifier. This will be found on the ISO wiring harness plugged into the rear of the radio. It will be either an blue or blue and white wire. If you are using an android car headunit, it should be the same wire, however it can be hit and miss with them. The best wire to connect the blue remote wire from the car amplifier would be the red wire that is switched with the ignition that turns the car stereo on and off.
If you have installed an aftermarket car audio amplifier onto a factory stereo, you will not have an wire that you can use. You will have to find a fuse circuit within the fuse box that is switched. The cig lighter one or rear window wiper is usually what people test. Get your multimeter and test some fuses in the glove box and identified one that does not have an constant voltage with the key out. Leave the multi meter on and turn the key, if you find the voltage goes to 12 volts you have found the fuse that you need to tap into. The best practise to do this is to use add a fuse tap. This allows you to add another circuit onto an existing fuse circuit in the fuse box, this extends it and provided a dedicated fuse for the remote wire we are going to create. Make sure you add a 5 amp fuse and add the existing fuse that you are going to tap into the fuse tap.
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