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<blockquote data-quote="profundus-sanus" data-source="post: 6121082" data-attributes="member: 572787">well... it all is relative to resting voltage...if you throw say a pm d3100 that rests at 13.1v in your car while retaining your stock battery that rests at 12.6v then that will be harmful to the powermaster... because its going to be &quot;charging&quot; the stock battery until they&#039;ve equalized voltage... although i definately don&#039;t see why the stock battery would be harmed.. i definately couldn&#039;t see any harm being done from running different size or age batteries from the same manufactureanother point i saw that i disagree with is calling a front/rear chassis ground redundant when there&#039;s a dedicated negative run..the best example was one i saw on a db drag street B car a year or so ago. The vehicle had 16 runs of 1/0 off 1 battery(using buss bars of course).first test was 8+ and 8-.. after moving more and more wires from positive to negative the loudest point was with&nbsp; 10+ runs 6- runs and about 6 1/0 chassis grounds front and back. I believe it yeilded .3-.4 db.. which if you know db drag thats a nice gain from something as simple as that.It would be vehicle dependent but my point is that grounding in the back will always be helpful, even if you have a dedicated negative run.</blockquote>

[QUOTE="profundus-sanus, post: 6121082, member: 572787"] well... it all is relative to resting voltage... if you throw say a pm d3100 that rests at 13.1v in your car while retaining your stock battery that rests at 12.6v then that will be harmful to the powermaster... because its going to be "charging" the stock battery until they've equalized voltage... although i definately don't see why the stock battery would be harmed.. i definately couldn't see any harm being done from running different size or age batteries from the same manufacture another point i saw that i disagree with is calling a front/rear chassis ground redundant when there's a dedicated negative run.. the best example was one i saw on a db drag street B car a year or so ago. The vehicle had 16 runs of 1/0 off 1 battery(using buss bars of course). first test was 8+ and 8-.. after moving more and more wires from positive to negative the loudest point was with 10+ runs 6- runs and about 6 1/0 chassis grounds front and back. I believe it yeilded .3-.4 db.. which if you know db drag thats a nice gain from something as simple as that. It would be vehicle dependent but my point is that grounding in the back will always be helpful, even if you have a dedicated negative run. [/QUOTE]

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