An car subwoofer can be installed into your vehicle to add more bass. If you have purchased an brand new car subwoofer and it is not powering on, chances are you haven't connected it correctly. To power on an car subwoofer, three important wires need to be connected, I am going to explain them to you in more detail. The remote turn on wire, which is usually an blue thin wire is what tells the subwoofer amplifier when to switch on and power off, if this is not connected to the correct wire, the subwoofer will not power on. The blue remote wire from the car amplifier should be connected to blue turn on wire on an aftermarket radio such as alpine, sony, pioneer, kenwood or jvc or to any other source that works an an switched ignition setup. If you have an stock radio, you won't have an dedicated turn on wire, so you will have to connect it to the ignition on wire that makes the power go off and on with the key for the car stereo. Refer to online wiring diagrams for your factory car stereo or get an multimeter to identify which wire is switched.
The red chunky 12 volt wire is what feeds direct power to the subwoofer, this long wire should be routed down the opposite were the rca cables go and connected with an inline fuse holder to the positive terminal found on the car battery. Make sure the fuse is not blown, remove it from the fuse holder and check if the wire is snapped within the fuse. Also make sure the ring terminal were the wire is crimped into is secure, loose or an broken connection can cause not enough voltage being sent to the car amplifier.
The black ground wire. This is the shortest of cables and is meant to be securely mounted to an bolt within the trunk area. The area were you mount the ground wire loop terminal should be an clean metal surface. It is suggested that you sand down the area with sandpaper or using an flat head screwdriver to remove any paint on the surface. Most people that fit there car stereo subwoofer for the first time are not aware that this procedure has to be done. Paint blocks electricity flow, and it is common that an poor ground attached to an broken screw found somewhere in the trunk is usually the cause to an car subwoofer not powering on.
Also check the fuse on the car amplifier itself, if this is blown your car amplifier will not power on. This can happen if somebody has cross wired the car amplifier or the fuse used in the past is too low. Refer to the user manual of the car amplifier you are using to find out the correct amp fuse rating. Replace any blown fuse with an brand new, your car subwoofer should now have power again. If both the car amp wiring kit you installed and the fuses look fine, then there is an fault with the car amp.
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