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2024 Rivian R1S — alternator whine after adding amplifier and DSP

BatteryRoadie551Community StarterApr 16, 20262024 Rivian R1S Dual-MotorCentral Jersey
System is quiet with the engine off, but a high-pitched whine follows RPM once running. Grounds look okay. What is the fastest isolation order for power, signal cables, processor and amplifier?
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BoostMechanicish509Community StarterCommunity StarterApr 17, 2026permalink
If it were in my driveway, move a coil or plug on the 2024 Rivian R1S if it's cylinder-specific and see whether the code follows. That's the branch I'd chase this week. If you share a photo of the worksheet, easier to sanity-check. I refuse to clear codes until someone else sees them.
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