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lack of power
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<blockquote data-quote="keep_hope_alive" data-source="post: 7436910" data-attributes="member: 576029"><p>12.5V means your alt is providing less than the vehicle+system is drawing. plain and simple.</p><p></p><p>if you increase engine RPM and the voltage jumps back up, then you know you draw more than the alt output at idle, but less than the alt rating. either turn it down when at idle or get a larger alt. more batteries will only help maintain 12.8V or so, not 14V.</p><p></p><p>if you drop regardless of engine RPM, but jump back up when you turn the volume down, then you know the alt is just too small and you should upgrade.</p><p></p><p>keep in mind that a drop in supply voltage is a drop in amp power output - most amps provide about half their rated output at 12V compared to 14.4V.</p></blockquote><p></p>
[QUOTE="keep_hope_alive, post: 7436910, member: 576029"] 12.5V means your alt is providing less than the vehicle+system is drawing. plain and simple. if you increase engine RPM and the voltage jumps back up, then you know you draw more than the alt output at idle, but less than the alt rating. either turn it down when at idle or get a larger alt. more batteries will only help maintain 12.8V or so, not 14V. if you drop regardless of engine RPM, but jump back up when you turn the volume down, then you know the alt is just too small and you should upgrade. keep in mind that a drop in supply voltage is a drop in amp power output - most amps provide about half their rated output at 12V compared to 14.4V. [/QUOTE]
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