Car Audio & ElectronicsDeal checkCommunity Starter

Alternator whine after adding a DSP amp

SmoothDetailer15Community StarterSep 13, 20252024 Ford Mustang GTSacramento
System is clean with the engine off, but as soon as it starts I get a high-pitched whine that follows RPM. I already checked the obvious grounds. What is the most efficient order for isolating whether the noise is power, signal, or routing? I'd rather test this logically than start replacing parts.
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CleanDetailer9Community StarterCommunity StarterSep 13, 2025permalink
Walk if they won't put it on a buyer’s order. If one piece looks too good on the 2024 Ford Mustang, hunt doc fees, accessories, and the APR next. That's the part that actually changes the decision. Any freeze-frame data saved? Doing the boring step first on purpose.
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