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<blockquote data-quote="Crownvicon28s" data-source="post: 6534964" data-attributes="member: 602517">I agree 13.5 isn&#039;t that bad of a drop, but me and the OP are measuring 13.5 at the alt and front battery, but 12.5 at the amp full tilt at idle. He is trying to figure out why his voltage is dropping so low at his bass amp and not at the alt. I was doing some brainstorming and I might be wrong. If your batteries in the trunk are wired parallel with your battery upfront, the amp is drawing more off of the batteries in the back and the least off of the batteries in the trunk. Maybe since the battery closest to the alt isn&#039;t really having that much of a draw the alt isn&#039;t charging at its fullest potential when there is a draw at the back batteries. Maybe a diode isolator would help eventhough you would lose ~.4 volts if I am correct. Or maybe run the power wire back to you rear batteries directly off of you alt if its not already this way. Thats about all I could come up with.</blockquote>

[QUOTE="Crownvicon28s, post: 6534964, member: 602517"] I agree 13.5 isn't that bad of a drop, but me and the OP are measuring 13.5 at the alt and front battery, but 12.5 [B]at the amp [/B]full tilt at idle. He is trying to figure out why his voltage is dropping so low at his bass amp and not at the alt. I was doing some brainstorming and I might be wrong. If your batteries in the trunk are wired parallel with your battery upfront, the amp is drawing more off of the batteries in the back and the least off of the batteries in the trunk. Maybe since the battery closest to the alt isn't really having that much of a draw the alt isn't charging at its fullest potential when there is a draw at the back batteries. Maybe a diode isolator would help eventhough you would lose ~.4 volts if I am correct. Or maybe run the power wire back to you rear batteries directly off of you alt if its not already this way. Thats about all I could come up with. [/QUOTE]

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