Article: Look at an automotive store to see what options they have for installation kits. Get a kit that has 8- or 10-gauge wiring so they can carry the full current without overheating and melting. Open the kit and separate all of the components so you can stay organized while you’re working.  Installation kits usually cost around $15–20 USD. The installation kit will include a red power cable, black ground cable, blue remote wire, RCA cables, in-line fuse, and connectors for all of the wiring. It does not matter what kind of stereo you use the amplifier with. You can use the stock car stereo or use one that’s after-market. Check the vehicle’s engine bay so you can see if the battery is on the driver or passenger side. Look in the footwell that’s on the same side as the battery to see if there’s a cutout in the firewall, which is the metal panel between the engine bay and interior. If there’s already one with wires coming through it, you can also feed the amp power cord through it. If you don’t see a hole in the firewall, use a drill bit made to bore through metal and create a new hole. Make sure there isn’t anything in the engine bay where you plan on drilling the hole. Start from the interior of your vehicle, and push the red cable through the middle of the hole. Feed about 4–5 inches (10–13 cm) of the cable before going to the engine bay and pulling it from the other side. Pull enough of the cable through so it reaches the battery.  The color of the power cord may vary depending on the installation kit you purchased. The power cord is the only wire that goes through your vehicle’s firewall. Find the thin blue wire from the installation kit, and feed one end through the hole in the dashboard behind the stereo. Push the wire down until you can see the end come out in the footwell. Line up the remote wire with the power cable so you can run them at the same time.  The remote wire turns on the amplifier when your stereo starts so it doesn’t drain the battery. The remote wire may also be called the turn-on wire. Position the wires so they run along the floor on the same side of the vehicle as the battery. Place the wires into the recesses that are normally covered with the trim pieces so they’re concealed later on. Run enough wire so the remote and power cables can easily reach the amplifier.  Don’t pull the wires tight since you’re more likely to damage them. If you didn’t remove the trim pieces, use a pry tool to push the wires underneath the trim. Look for the blue or silver cable that has red and white inputs on each end. Feed one end of the RCA cable through the hole in the dashboard behind the stereo system and push it through until you see it in the footwell. Run the cable along the side of your vehicle so it’s in the recesses normally covered by trim. Pull the cable so it can reach where you’ve mounted the amp. Don’t run the RCA cables on the same side as the power cable since you may pick up audio interference when you’re running the amplifier. The number of speaker wires you run depends on how many speakers you want connected to the amp. Start the speaker wire near your amp and run it to the speaker you want to attach. Take out the old speaker wires from the ports before putting in the new ones in. Tighten any screws or fasteners that hold the speaker wires so they don’t pull out. Repeat the process for any other speakers you want to wire.  You may need to remove additional trim pieces to hide speaker wires running through your vehicle. Your installation kit may or may not have speaker wires. If it doesn’t get a roll of speaker wire from your local hardware or electronics store.

What is a summary?
Buy an amp installation kit so you have all of the proper wires. Find a hole in your vehicle’s firewall on the same side as the battery. Feed the red power cord through the hole in the firewall. Pull a blue remote wire behind the stereo head so it comes out by the power cord. Tuck the power and remote wires on the floor along the sides of your vehicle. Run the RCA cable on the opposite side of the vehicle as the power. Connect speaker wires to each speaker you want hooked up to the amp.