If you have recently installed an car amplifier and are not getting power to it, then this guide will help you fix your broken car audio system. The first thing to check is to make sure the fuses are in good condition. There are generally two fuses in car audio for an car amp. There will be one fuse on the red thick power wire that goes to the car battery. This fuse protects the 12 volt feed going into the amp, if there is an short or if the incorrect fuse size is used, it will blow the fuse. There is also another fuse placed directly into the car amplifier itself, sometimes there will be more than one. If any of these fuses are blown, the car amplifier will not power on, these fuses protect the car amp from blowing up. To identify if an car audio fuse is blown, simply remove it from the
holder and check to see if the wire inside the fuse has snapped. Once
this happens, the fuse will provide an broken circuit stopping
electricity flowing through the wire. Always remember when changing fuses, that you use the correct amp fuse when replacing.
If the fuses look fine, then ensure that the blue remote turn on wire for the car amplifier is connected to the correct wire. The remote turn on connection on an car amplifier is responsible for powering the car amp on and off. Usually this wire is connected to an ignition based switch source, to prevent the car amp draining the battery and staying on all night. Get an multi meter and measure the voltage on this wire when you key the car on and off. When keyed on, the reading should be 12 volts and when keyed off should be reading 0 volts. If you are getting no readings at all, chances are you have connected the blue remote turn on wire to the wrong wire. The best wire is to connect it to the red wire on the back of the car stereo, this will be the same circuit that provides ignition switched power to your car stereo.
An bad ground can also cause an car amplifier not to power on. I have seen some people mount the ground for an car amp poorly and attach it to an random screw they find in an plastic panel. The proper way to find an ground in your car, is to find an area that is close to the chases as much as possible. Ideally, my preferred ground location is using an seat belt bolt. Once you have found an proper grounding location for your car amplifier, you want to remove any excess paint around the area. This will ensure the best connection between the ring terminal and the ground location itself. Make sure you use an bolt and tighten it as best as possible to provide an secure and reliable connection.
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