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<blockquote data-quote="Home2CarSpeaker" data-source="post: 3302227" data-attributes="member: 580194">I have a serious alternator whine problem along with the accompanying thuds during channel switching etc. I have a Pioneer DEH P-880 HU which has performed flawlessly with the amp and sub I use until the other day when I was turning up the power amp sensitivity a little and I got a loud screech. After going through all my speakers, testing the amp with another source etc. I isolated the HU as the culprit. It hasn&#039;t screeched again yet but I have the alternator hum quite prominently. Is there any chance something shorted in the HU in terms of grounding or fuses or could my alternator just be about fried. Any help would be appreciated.System Pioneer: DEH-P880 Head Unit, Sirius/Pioneer Receiver, Jenson 780 Watt Stereo Power Amp, Kenwood Powered Bazooka Sub, B&amp;amp;W 5 1/4&quot; Home Audio Speakers W/ 1&quot; Dome Tweeters in Front, 3D Acoustic 6.5&quot; Home Audio Speakers W/Road Master Tweeters in Back.</blockquote>

[QUOTE="Home2CarSpeaker, post: 3302227, member: 580194"] I have a serious alternator whine problem along with the accompanying thuds during channel switching etc. I have a Pioneer DEH P-880 HU which has performed flawlessly with the amp and sub I use until the other day when I was turning up the power amp sensitivity a little and I got a loud screech. After going through all my speakers, testing the amp with another source etc. I isolated the HU as the culprit. It hasn't screeched again yet but I have the alternator hum quite prominently. Is there any chance something shorted in the HU in terms of grounding or fuses or could my alternator just be about fried. Any help would be appreciated. System Pioneer: DEH-P880 Head Unit, Sirius/Pioneer Receiver, Jenson 780 Watt Stereo Power Amp, Kenwood Powered Bazooka Sub, B&W 5 1/4" Home Audio Speakers W/ 1" Dome Tweeters in Front, 3D Acoustic 6.5" Home Audio Speakers W/Road Master Tweeters in Back. [/QUOTE]

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