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1990 Ford F-150 XLT — anyone else: Alternator whine after adding a DSP amp

CruiseTuner71Community StarterMay 31, 20261990 Ford F-150 XLTLos Angeles
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?
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