How to Fix a Car Amp

Don't let troubles with your car amplifier silence your fun. Learn how to troubleshoot your car amplifier to resume enjoying your music.

You will need

  • Multimeter
  • CD player
  • Headphone to RCA cable
  • Working speaker
  • Cooling fans (optional)

Step 1 Unhook speaker wiring and RCA cables Unhook all cables and wiring from the car amplifier so that only the power, ground, and remote leads are connected.

Step 2 Check the connections Check the connections. Make sure the amp is grounded to a bare piece of metal free from rust, and that the remote wire is hooked up and connected to the blue wire with a white strip on the head unit.

Step 3 Inspect the amp Inspect the amplifier for loose hardware, screws, or nuts.

Step 4 Reconnect the other wires Reconnect the speaker wires and RCA cables.

Step 5 Replace transistors Remove and check any transistors that read zero ohms. Replace the transistor if it is defective.

Step 6 Turn down the gain Turn down the gain. If the amplifier is getting hot and shutting down, the gain might be turned up too high.

Step 7 Connect a CD player Using a headphone to RCA cable, connect a CD player to the RCA input of the amplifier to see if the amplifier has sound. If it does, the head unit’s output or cable is bad.

Step 8 Hook up a working speaker Hook a working speaker up to the amplifier if you are not getting sound. If you get sound from the working speaker, then the speakers in your car are blown.

Step 9 Take it to a repair shop Take the amplifier to a repair shop if none of these fixes work.