The last thing anybody wants is an dead battery. An car amplifier requires 12 volts constant and also an remote wire that provides an signal to turn on and off. If the remote wire is incorrectly connected, then it may cause your car amplifier to always be powered on. This can cause an unexpected drain on your car battery. If your car amplifier has an Power status LED that is always in the ON position, then you need to correct the wiring before it drains your car battery.
There are two methods to wire an remote wire on your car amplifier. The first method is to wire it to an fuse that is ignition switched with the key, this is common if you are using the factory car stereo and rca converter combination. You can obtain an fuse tap, that will split the existing circuit in the fuse box into two parts, it will retain an original circuit while also adding separate circuit dedicated for the remote wire on your car amplifier. I recommend using an 5 amp fuse for the remote wire and remove the existing fuse from the fuse box and add it into the fuse tap.
To test which fuse location is ignition switched, an multi meter would be required. Place the black probe onto some metal of the vehicle and place the red probe onto a fuse that you want to test. Turn the ignition on, does it read 12 volts with the key or is it always reading 12 volts. If it is always reading 12 volts, then this means it is an constant fuse. You don't want to use this as this will provide power all the time to the remote wire all the time, making your car amplifier always stay on. You want to find an fuse that provides 12 volts on and off with the car ignition.
If you have an aftermarket headunit, either an branded one such as an pioneer, alpine, jvc or sony or an android Chinese radio, if you look in the back of the ISO wiring loom, you will see an blue and white wire or blue, usually labelled as amp turn on and amplifier. This is an circuit within the headunit that will provide an on an off ignition to your car amplifier. This is the official way to do it. Get an long blue remote wire and attach it to this using solder and heat shrink or PVC insulation tape. Run the blue remote wire all the way to the back of car trunk and insert it into the remote terminal on the car amplifier.
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