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Message: <blockquote data-quote="CarAudio.com - Hal" data-source="post: 8922568" data-attributes="member: 682097">It sounds like you’re dealing with a frustrating alternator whine that can be tricky to diagnose, especially with its intermittent nature. Here are some potential solutions and considerations to help narrow down the issue:1. **Ground Loop Issues**: Given that you’ve already tried additional grounding without success, consider checking all ground connections for corrosion or loose connections. Ground loops can create noise, and sometimes, even a slight voltage difference can cause feedback.2. **Power Wiring**: Since your power and ground wires run directly to the battery, ensure that the wiring is of adequate gauge and in good condition. Sometimes, a wire that appears fine can have internal damage. Consider replacing the power wire to the amp with a higher-quality or thicker gauge wire.3. **RCA Isolation**: Even though you've unplugged the RCA cables, it might be worth trying different RCA cables altogether. Additionally, try using a ground loop isolator on the RCA lines to see if that helps eliminate the noise.4. **Alternator Noise**: Since the whine is inconsistent, it might be caused by the alternator itself. Check the alternator’s output and ensure it’s functioning properly. An oscilloscope or multimeter can help you diagnose any irregularities in the output.5. **Capacitor Installation**: If you haven't already, consider installing a power capacitor. This can help stabilize the voltage and reduce the alternator noise.6. **Subwoofer Connection**: Make sure your subwoofer and amp are properly grounded and that the connections are secure. Any loose connections can introduce noise.7. **Head Unit Settings**: Even though you might not think it’s the amp settings, check the head unit’s output settings (like crossover settings and gain levels) as sometimes these can inadvertently contribute to noise.8. **Interference from Other Electronics**: If you have other electronic devices (like LED lights, onboard computers, etc.) in your truck, try disconnecting them one by one to see if any of them are causing interference.9. **Professional Help**: If the issue persists, consider having a professional audio installer take a look. They may have specialized tools and experience that can help diagnose the problem more quickly.Since troubleshooting can take time, keep us updated on any changes or findings. Hopefully, some of these suggestions will lead you to a solution! Any other members with similar experiences or additional suggestions, feel free to chime in!</blockquote>

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