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| Car amp fuse holder with digital volt meter |
If your car amplifier has short circuited, either the power or ground wires have touched or the fuse is too small for the overall current your car amplifier pulls. When this happens the current fuse found in the fuse holder will become blown out. The car amplifier will no longer get its 12 volt constant feed from the positive terminal found on the battery, this will result in no power to your car amplifier. This is because the thin wire found on the fuse itself has snapped, when this happens it breaks the circuit.
Firstly, before changing the car amplifier fuse on the red power wire, you need to first fix the problem. The fuse had blown for an reason, there could be wires touching at the car amplifier side of things. There could be broken braid of wires shorting the ground and positive out, also make sure there is no cuts on the power wire, check the insulation all the way down the car. Sometimes, the insulation on positive wire can expose copper braid from the 12 volts and short down the metal of the car if its been pinched by an metal clip. This is can happen when you have not moved the wires out of the way were the clip falls into place on the side trims.
You also need to ensure the fuse that you use matches the correct ampage your car amplifier pulls. You will get this exact information from the specification found in the manual. It will tell you how much RMS the car amplifier you are using to power your car subwoofer and the maximum current draw. Ideally, you want to install an fuse for your car amplifier that is around the amps rating it pulls. For example if your car amplifier pulls 80 amps of current, you want an fuse rated close to this number. This allows the fuse to actually work if something does go wrong, as it will protect your vehicle's wiring and prevent your car amplifier from blowing up. I always suggest that you mount your car amplifier either to the back of the rear car seats of the back of the subwoofer enclosure box. This will prevent it moving around when driving, also to ensure each and every screw on the terminals is secured down firmly.
Some car amplifiers also have there own fuses on them. This fuse is mainly to protect the car amplifier from getting damaged from an fault in the wiring or if the car amplifier detects something unusual. The fuses are easy to change, you simply pull them out using your hands or pliers. Hold the fuse up near light, if you see the small wire broken the fuse will need replacing. Simply pop in your new fuse and your good to go. In terms of changing the fuse on the fuse holder found inline with red power wire for your car amplifier, usually there will be an plastic cover, this simply clips off. The car audio fuse holder will mount the fuse using two screws usually one on the left and the other on the right. You may need an hex key or an appropriate screwdriver to remove them, as they can be an odd size. Remember if you don't have the correct tool to remove them, go buy one! Once the screws are stripped from trying different shape screwdrivers it is impossible to remove them screws.
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