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<blockquote data-quote="hispls" data-source="post: 8078204" data-attributes="member: 614752">Well a DMM isn&#039;t a load test!&nbsp;&nbsp; A proper parts store (in USA anyway) has a big machine that they put the battery in, hit a button, and it runs tests and spits out a printout of performance data.&nbsp;&nbsp; A battery with a strong looking resting voltage can be virtually dead!&nbsp; &nbsp; Shame you don&#039;t have Sears Automotive there... they usually have fair prices on tires and batteries and such.If you&#039;re charging at &amp;gt;14V it&#039;s unlikely your alt is bad.&nbsp;&nbsp; Keep in mind at idle you have MUCH less output from alternator than at 2K rpm, and output drops with heat as well.&nbsp; &nbsp; At the moment you should be OK since AFAIK JL has a regulated power supply, it it&#039;s enough voltage to turn it on it&#039;ll make true power.Like I said, I&#039;d have no worries running a 3K amp with a couple beefy AGM batteries in the back and a solid one up front..... make it 3 bats in the back if you plan to mess around at .5 ohm for more than burps.*EDIT*So what is actually grounding the chasis of your alternator????</blockquote>

[QUOTE="hispls, post: 8078204, member: 614752"] Well a DMM isn't a load test! A proper parts store (in USA anyway) has a big machine that they put the battery in, hit a button, and it runs tests and spits out a printout of performance data. A battery with a strong looking resting voltage can be virtually dead! Shame you don't have Sears Automotive there... they usually have fair prices on tires and batteries and such. If you're charging at >14V it's unlikely your alt is bad. Keep in mind at idle you have MUCH less output from alternator than at 2K rpm, and output drops with heat as well. At the moment you should be OK since AFAIK JL has a regulated power supply, it it's enough voltage to turn it on it'll make true power. Like I said, I'd have no worries running a 3K amp with a couple beefy AGM batteries in the back and a solid one up front..... make it 3 bats in the back if you plan to mess around at .5 ohm for more than burps. *EDIT* So what is actually grounding the chasis of your alternator???? [/QUOTE]

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