- 1). Open your car's fuse panel and locate the fuses that power your radio and amplifier. Visually inspect the fuses to make sure they don't have cracked filaments or are burnt around the silver contacts on the end. Replace any damaged fuses and check your car's audio system before moving to the next step.
- 2). Remove the amplifier from the housing it is mounted in carefully with a Phillips-head screwdriver. Make sure you do not pull any of the wires connecting your amplifier to other components out.
- 3). Check to make sure there are no loose connections on the amplifier or preamplifier section of the unit. If there are loose connections, unplug the cable and firmly re-seat the cable. Test the unit before moving on to another potential problem. Loose cabling is a fairly common car audio problem.
- 4). Test the audio cabling connected to the amplifier with a multipurpose cable tester that can test both RCA cables and speaker cables. All cable testers are different, so you may need to read your owner's manual for proper operating instructions. Replace any cabling that is found to be faulty with new working cabling of the same type. Test the unit before moving on.
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