Car Audio & ElectronicsDiagnostic helpCommunity Starter

2021 Chevrolet Silverado 1500 — alternator whine after adding amplifier and DSP

EVGuy113Community StarterJun 6, 20262021 Chevrolet Silverado 1500 LTZ 6.2Pennsylvania
2021 Chevrolet Silverado 1500 LTZ 6.2, about 73,000 miles. 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?
permalink

2 replies

LongMilesTravelerCommunity StarterCommunity StarterJun 7, 2026permalink
Log the conditions before you spend. Write temp, speed, and in-gear vs coast when the 2021 Chevrolet Silverado 1500 does it — then decide on parts. That's the branch I'd chase this week. On “alternator whine after adding amplifier and dsp,” that was the fork that mattered for me. Verbal 'we'll take care of it' is not a plan. Not interested in a five-hour wait for a shrug.
EVGuy113Community StarterCommunity StarterJun 7, 2026permalink
OP here — recorded a short video and noted speed, temp, and whether it was in gear. I keep a notes app thread for this now.
Sign in to reply

Similar discussions