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Big Voltage Drop!


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I am currently running a Sundown saz1500 at 1 ohm. I have a yellowtop up front and a shruinken 1500 in the back. When i turn my car on i read 14.1v however when i start driving my volatage goes down to 12.1-12.5v? Even if i do not have my amp turned up i still get drop. However when i turn my a/c on i go back up to 13.6 while playing my amp at full tilt? Does this make any sense?

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What year make model vehicle would help?

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pcm controlled alt?

thats what it sounds like

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