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<blockquote data-quote="audioholic" data-source="post: 7385124" data-attributes="member: 549629">Yes, isolators have more internal resistance than relays (which is one of the reasons I usually use a relay), but today&#039;s isolators are much better than the old ones that gave them a reputation for being a voltage hog.It doesn&#039;t matter if the alt is running or not, if you use a relay and your batts are not fairly close in internal resistance, the problem still exists. You are correct that when system voltage is pegged at 14.4, the alt is supplying all the power that is being used. But we both know most people&#039;s voltage does not stay pegged at 14.4, and many times voltage dips to the point that the batt(s) supplies the power the alt is insufficient to supply. We are, after all, discussing this in a thread where the OP has an 80 amp alt Ive already explained cannot solely power his stereo AND the car itself. OP&#039;s case is one of the more extreme ones, but even most people with an adequate charging system still rely on the batt(s) to supply power during peak power demands such as heavy or long bass notes.</blockquote>

[QUOTE="audioholic, post: 7385124, member: 549629"] Yes, isolators have more internal resistance than relays (which is one of the reasons I usually use a relay), but today's isolators are much better than the old ones that gave them a reputation for being a voltage hog. It doesn't matter if the alt is running or not, if you use a relay and your batts are not fairly close in internal resistance, the problem still exists. You are correct that when system voltage is pegged at 14.4, the alt is supplying all the power that is being used. But we both know most people's voltage does not stay pegged at 14.4, and many times voltage dips to the point that the batt(s) supplies the power the alt is insufficient to supply. We are, after all, discussing this in a thread where the OP has an 80 amp alt Ive already explained cannot solely power his stereo AND the car itself. OP's case is one of the more extreme ones, but even most people with an adequate charging system still rely on the batt(s) to supply power during peak power demands such as heavy or long bass notes. [/QUOTE]

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