Audio Wiring / September 7, 2018 / Raquel Dufour.
Route the power cable from the battery through the passenger side of the car to the amplifier in the trunk. It will prove most natural because the battery is commonly on the passenger’s side of the vehicle. You will have to feed the power cable through a rubber grommet on the firewall.
Perhaps the most time-consuming and most important element of a car audio installation is the wiring. There are power cables, ground cables, signal (RCA) cables, speaker wire and more. Then there is the connection of cables to ignition sources, constant 12-volt sources, etc. The process may sound overwhelming. However, if you attack it in small bites, you will find that it is not as difficult as you expect.
It is the first consideration when you install your amplifiers. Most people mount the speaker in the trunk for esthetic and safety reasons. It would help if you also considered the maintenance of your car when installing a car amplifier in the nose. Too often, people install systems that make replacing the fuel pump or taillight bulbs difficult. Keep in mind that mechanics charge by the hour for labor.
Connect the Power and RCAs, then reconnect the negative battery terminal. Re-install the head unit and play some music, making sure everything is connected correctly.