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So are you saying that your normal voltage stays at 13.2 without music playing? If so, that's issue number one, the voltage drop to 11V can wait.

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well not really.. if the alternator is good enough it shouldn't drop regardless of voltage that is running at.. its the amperage that makes voltage drop.. if the alternator is a 320a and drops to 11v on with a possible 120A draw then there is an issue.. i think it could be bad connections and even a clipping amplifier.. it dont matter what voltage the alternator charges.. could be 13.4 or 14.8 the voltage shouldnt drop that bad.. if its dropping to 11v volts at 13.2 it will drop to 11v even if its charging at 14.8

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What brand 320A alt?

DC Power

Nav-TV Zen V Audio Interface

AudioControl DM-608

(2) Stevens Audio Neo-Comp Full-Size Horns

(4) Faital Pro 6PR160 6.5"

AudioControl LC-6.1200

(1) Fi Neo 4.7 15" D2 in 3.74 Cubic Feet @ 27.70 Hz

Ampere Audio AA3800.1

Odyssey ODP-AGM48 Battery (Starting)

Odyssey ODX-AGM31 Battery (Trunk)

Big 3 - 2\0 Welding Cable, KnuKonceptz Speaker Wire & 1/0 Power Cable, NVX RCAs, Second Skin (Speaker Tweaker Pads, Damplifier Pro Mat), Diode Dynamics LEDs

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If he's sitting at 13.2 normally then the alt might not be charging at proper voltage and probably isn't outputting much of anything all is what I was getting at. Meaning bad alt. No alt should charge at 13.2, even a shitty eBay one. If that's what his voltage sits at normally, then I would check all connections to batteries and alt with the amplifiers disconnected, and if everything is tight without wiggling at all, but voltage is the same, id be swapping in the stock alt to see if voltage changes. If no change, he's got a computer issue.

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