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Discussion Starter #1 (Edited)
https://youtu.be/IzloPLxC7Q0

Head unit is the only audio upgrade. I do have the stock amp connected with the metra harness. HU works great otherwise. Need some help guys, I feel like I've tried all of the typical solutions. This only happens when the temperature is below 60 degrees F. Noise goes away after it has been on for a few minutes. Noise is independent of RPM, source, and volume. Temperature seems to be the only factor.

Alpine UTE-62BT

TIA everyone
 

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Discussion Starter #3
That sounds like alternator whine to me. If memory serves me right, it’s possibly due to a bad ground.
but this is completely independent from RPM, it makes the same noises no matter what the engine speed. I always thought alternator whine changed frequency based on RPM? LMK if I'm wrong. I've also changed grounds from the harness to the location directly behind head unit with no change. Also grounded the under seat amp to same ground as HU (on a different occasion) with no change. Thanks for the reply.
 
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