Now the role of an fuse is to protect an circuit, if its blowing an fuse each time, then there is an short circuit. The first thing to check is if you have not wired the positive and negative terminals in reverse found on the car amplifier itself, as this can blow the fuse. The red power wire from the positive terminal from the car battery needs to be connected to battery or 12 volt + labelled terminal on the car amp. The black wire mounted onto an bolt connecting onto the metal chassis on the car needs to be connected to the ground terminal on the amplifier. The blue remote wire needs to be connected to an ignition switched source. This is usually the blue wire found on the back of an aftermarket radio or into an switched circuit found inside the fuse box, using an fuse tap.
You also need to make sure that there are no old copper braids stuck in each terminal and that no wires are making contact with each other. Sometimes they can make contact with the opposite terminal on the other side and short the car amplifier out. This can happen when the previous installer had pulled the wires from an old car amp wiring kit, instead they should have unscrewed the screw and removed the wire. Loosen each terminal screw, use an flat head to remove any old wires and blow directly into them using your mouth. Do this for all the power terminals and speaker terminals, give them an good clean.
Once you have verified that the connections are correct and there are no short founds on the car amplifier terminals, the subwoofer or speaker you are using could have an short inside the coil. If an speaker has an bad coil, this can blow the fuse on an car amplifier. This is rare in most cases but it can happen. Try inserting an brand new fuse into the car amplifier, but before you power it on disconnect any speaker wire. If the car amplifier doesn't blow your fuse, then you know the speaker or subwoofer you are intending to use is causing the short. This can also be the speaker wire inside the terminal cup shorting out or the wires connected to the speaker making contact with each other. Remove the speaker from the enclosure and inspect the wire and make sure the connections are firm.
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