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<blockquote data-quote="Saint211" data-source="post: 5070142" data-attributes="member: 564903">Definitely sounds like an alternator problem IMHO.At idle you should have higher voltage.&nbsp; I have a stock alternator, a deka 9A34M up front, and a deka 9A31 in the rear right now.&nbsp; Big three is done in 0 gauge and I also have three power runs fused @ 250 amps a run, and 2 straight ground runs for now&nbsp; Im pretty sure the batts rest at 12.6 car off.&nbsp; At idle I charge at 14.5 after sitting all night on a chilly morning... that settles to 14.2 after warming up.If Im warmed up driving and wang for half an hour then park and idle it(only 2800 watts for the time being) I charge at 13.9-14.1Point is I idle at 13.9-14.5 with a stock 130 amp alternator.&nbsp; Your setup is technically &quot;beefier&quot; than mine right now with the exception that I have multiple runs between batts.&nbsp; You said your batts rest at 12.4.&nbsp; Then you said your car idles in the 12&#039;s..... and you get into the 13&#039;s revving the engine.&nbsp; You are pretty much running off the batts at low RPM&#039;s.&nbsp; this could be a number of problems... im not an alternator expert but it sounds like you either need a different size pulleyor a different alternator.&nbsp; I have talked to nathan and he says he builds all custom alts, but this could also be a problem you would see from an alternator that is re-wound too much.By the way all of my general numbers come from the voltage meter on my pioneer,&nbsp; as well as DMM tests done by myself at each battery and each amp.&nbsp; The rear of the car is generally very close to the front, as my power run to the back is super beefy for only 2800 watts.Somethings just not right there man.&nbsp; Try talking to nate, I know he mentioned to me about the pulleys,&nbsp; so that might be a good place to start</blockquote>

[QUOTE="Saint211, post: 5070142, member: 564903"] Definitely sounds like an alternator problem IMHO. At idle you should have higher voltage. I have a stock alternator, a deka 9A34M up front, and a deka 9A31 in the rear right now. Big three is done in 0 gauge and I also have three power runs fused @ 250 amps a run, and 2 straight ground runs for now Im pretty sure the batts rest at 12.6 car off. At idle I charge at 14.5 after sitting all night on a chilly morning... that settles to 14.2 after warming up. If Im warmed up driving and wang for half an hour then park and idle it(only 2800 watts for the time being) I charge at 13.9-14.1 Point is I idle at 13.9-14.5 with a stock 130 amp alternator. Your setup is technically "beefier" than mine right now with the exception that I have multiple runs between batts. You said your batts rest at 12.4. Then you said your car idles in the 12's..... and you get into the 13's revving the engine. You are pretty much running off the batts at low RPM's. this could be a number of problems... im not an alternator expert but it sounds like you either need a different size pulley or a different alternator. I have talked to nathan and he says he builds all custom alts, but this could also be a problem you would see from an alternator that is re-wound too much. By the way all of my general numbers come from the voltage meter on my pioneer, as well as DMM tests done by myself at each battery and each amp. The rear of the car is generally very close to the front, as my power run to the back is super beefy for only 2800 watts. Somethings just not right there man. Try talking to nate, I know he mentioned to me about the pulleys, so that might be a good place to start [/QUOTE]

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