How to Connect Car Amplifier Wires?

[MackenzieDella]

First, check if the car's head unit is the original factory model. Then find an amplifier control wire; the amplifier's connector is REM, which requires positive power. Next, connect a dedicated amplifier fuse from the positive terminal of the battery. The wire should run from the fuse to the +B terminal of the amplifier. After that, connect the ground near the amplifier to the GND terminal of the amplifier. Once installed, you can connect the speakers.

[DelMolly]

Wiring a car amplifier isn't actually difficult, I've done it several times myself. You just need to prepare the right tools. First, run the power cable from the positive terminal of the battery - remember to install a fuse in the middle for circuit protection. Then find a metal point on the car body for the ground wire, usually screw locations work better. Next are the RCA cables, connect them from the head unit's output to the amplifier's input; it's like plugging in your phone's headphone jack, just don't mix up the left and right channels. Finally, the speaker output wires should be connected to the corresponding speakers according to polarity - don't reverse them or the sound will distort. A small detail: remember to add a remote turn-on wire to control the amplifier's power. During installation, using thicker wires can reduce voltage drop, avoid using wires that are too thin to prevent overheating and burning out. Before testing, use a multimeter to check for any shorts - if the audio plays clearly when you turn on the system, you're good. Regularly check if connection points are loose - this can save you a lot of trouble later.

[KhloeFitz]

When installing a car amplifier by myself, safety should never be overlooked. Starting the wiring from the battery, the fuse is absolutely crucial—it will blow to prevent fire in case of excessive current; never skip it for convenience. Choose a solid grounding point on the car body, avoiding rusty spots, as poor contact may occur. Keep RCA input cables away from power lines to avoid interference noise; if you hear humming, check the cable distance or switch to shielded cables. Ensure the speaker output is correctly aligned with positive and negative terminals—wrong connections degrade sound quality and may damage the speakers. It’s advisable to wear gloves and goggles throughout, using insulated tools; avoid smoking near the battery. After installation, check for stable voltage without fluctuations, and ideally, have a professional test it. Regularly inspect wiring for wear and replace it promptly.

[FaithFitz]

I only understood how to wire it after learning it myself, so beginners don’t panic. Simply put: First, connect the power wire to the battery positive terminal, with a fuse in between. Second, ground the wire to a reliable point on the car body. Third, use RCA cables to connect from the head unit to the amplifier input. Fourth, connect the speaker wires to the amplifier output terminals, observing polarity. Tools needed are just a wrench and wire strippers. Ensure the location is well-ventilated and don’t pile wires on top of each other. Test the sound first to see if it’s normal; if there’s noise, check for crossed wires. Avoid cheap cables—reliable brands ensure better performance.