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First: make sure that you have disconnected the wiring from the negative battery terminal. This is vitally important because until you have done this interfering in any way with the electrics of your car is highly dangerous.
Second: purchase an amplifier kit from a car audio supply store. These should have all the wiring necessary for your installation. Check that the wiring is the correct gauge for the power of amp that you have bought (i.e. the RMS). Once you have this kit then you should have all the equipment you need, although you will still require a pair of wire cutters and wire strippers.
Third: decide where you are putting your amp in your car. Although it is tempting to show off your new equipment, the first rule of car security is to keep anything that might be stolen out of sight. It is for this reason that many people choose to put their amps in the car boot or under a seat - like the passenger seat. This keeps them out of sight but does not make wiring in your amplifier more difficult than it has to be.
Next: you should have a red 'live' wire and a black 'ground' wire. The red wire connects to the positive (+) side of the battery and should have a fuse (of an appropriate size for your amp) within 45 centimetres, or 18 inches, of the battery. This should then run through the firewall of your car, under the carpet, to the amplifier.
The black wire connects to the negative (-) terminal of the amp and needs to touch a piece of clean, bare metal on the car frame - i.e. metal that is not painted or rusty, a metal bolt or screw is a good place to connect to. This wire will also run under the carpet of the car away from the amplifier.
There should also be RCA cables that will connect the amp to the head unit of your stereo. To avoid mix up, keep these as far as possible from the power wires although keeping them under the carpet.
The next step is to link the amp to the main stereo using the blue wire. Connect this to the blue wire of your stereo system and you will be able to access your car amplifier from the head unit.
Finally, connect your amp to the car speakers, again keeping the wires as separate and distin
