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<blockquote data-quote="gunz4me2" data-source="post: 6488938" data-attributes="member: 613729">Pioneer decks are known for the PICO fuse issue because when it blows, you will get that whine.&nbsp; Also, ground loops and certain GM vehicles used to be a royal PAIN to resolve.Unfortunately, if connecting your amplifier to another battery completely isolated from the vehicle solved the problem, you may have noise coming in through the power wire.&nbsp; In SOME cases, a capacitor on the power line can filter out this noise.ETA:&nbsp; You could have bad diodes in the alternator too.&nbsp; Connect a Digital Multimeter to your battery and test for AC voltage with the vehicle running.&nbsp; If you have more than 1v of AC, you may want to look into replacing/repairing the alternator.&nbsp; IIRC, .5 to .7 volts of AC is acceptable with the vehicle running and any more usually indicates a problem with the alternator.ETA2:&nbsp; What is the age/condition of the vehicle&#039;s battery?</blockquote>

[QUOTE="gunz4me2, post: 6488938, member: 613729"] Pioneer decks are known for the PICO fuse issue because when it blows, you will get that whine. Also, ground loops and certain GM vehicles used to be a royal PAIN to resolve. Unfortunately, if connecting your amplifier to another battery completely isolated from the vehicle solved the problem, you may have noise coming in through the power wire. In SOME cases, a capacitor on the power line can filter out this noise. ETA: You could have bad diodes in the alternator too. Connect a Digital Multimeter to your battery and test for AC voltage with the vehicle running. If you have more than 1v of AC, you may want to look into replacing/repairing the alternator. IIRC, .5 to .7 volts of AC is acceptable with the vehicle running and any more usually indicates a problem with the alternator. ETA2: What is the age/condition of the vehicle's battery? [/QUOTE]

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