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Originally Posted by 993K
What do you mean disconnect all of the sources? All wires to the HU?
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No, disconnect all of your major electronics from their power/ground wires. Amps, HU, and your pulse signal, possibly antenna- (whatever else A/V you have powered).
Then one by one reattach them. Do this to determine the source of the noise. If you have all of your powered electronics disconnected, and you still hear alt whine, more than likely it's a wiring problem with the Battery/Alternator or one is failing. (diodes on the alt, or battery IR)
BTW, how is your HU grounded, and how is the pulse signal unit grounded?