After installing an aftermarket stereo system, some drivers may experience what is known as alternator whine. Alternator whine is the noise generated by your engine's alternator and transferred through to your car stereo speakers. Misconfigurations in the car stereo's wiring and amplifier set up are the most common contributing factors to engine noise in your car stereo. Typically, the noise increases as you accelerate and decreases as you decelerate, illustrating consistency with the engine's operating RPM level.
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Things you need
- Screwdriver set
- Spare stereo wiring
- Ground loop isolator
Locate a grounding point on your vehicle's engine bay. Some cars have grounding points installed from the factory next to the battery. If you do not have a factory ground point, you can create one by finding a piece of metal in the engine bay that is unexposed to any electrical wiring.
Scratch the metal surface of your grounding point so that the bare metal is exposed. The electrical ground will not work correctly unless it is touching bare metal. Paint or other materials can cause electrical interference and the ground to fail.
Use this new grounding point as the common ground point for all your stereo's components. This will create a ground loop and enforce a closed circuit connection on your car's stereo system.
Install the ground loop isolator by connecting it to the positive wire coming out of your stereo's head unit. Run the other wire coming out of the ground loop isolator directly to the new common ground you created in Step 2.
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