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<blockquote data-quote="spoonraker" data-source="post: 4138967" data-attributes="member: 570956">You are mistaken. When your car is running, the battery isn&#039;t the only source of electricity, the alternator is as well. The alternator produces current at a significantly higher voltage than the battery. Most alternators sit around 14.4 and most batteries around 12.7 when fully charged. The alternator is hooked to the same circuit as your battery, and if you remember basic electrical laws you would know that electricity always flows from the highest electrical potential to the lowest. In the case of your test, from your alternator to your DMM. So even though you might be probing your battery terminals, you are really just taking a reading of your alternator&#039;s voltage. This is why when you turn the car off the voltage returns to battery voltage, mid-upper 12s.What a cap is supposed to do is keep the voltage above that of the battery&#039;s during a bass hit so that the battery doesn&#039;t take the load, however in reality the cap only takes the load for a fraction of a second and sort of eases the load onto the battery. However, the full load still almost immediately transfers to the battery, and you see almost no benefit.</blockquote>

[QUOTE="spoonraker, post: 4138967, member: 570956"] You are mistaken. When your car is running, the battery isn't the only source of electricity, the alternator is as well. The alternator produces current at a significantly higher voltage than the battery. Most alternators sit around 14.4 and most batteries around 12.7 when fully charged. The alternator is hooked to the same circuit as your battery, and if you remember basic electrical laws you would know that electricity always flows from the highest electrical potential to the lowest. In the case of your test, from your alternator to your DMM. So even though you might be probing your battery terminals, you are really just taking a reading of your alternator's voltage. This is why when you turn the car off the voltage returns to battery voltage, mid-upper 12s. What a cap is [I]supposed[/I] to do is keep the voltage above that of the battery's during a bass hit so that the battery doesn't take the load, however in reality the cap only takes the load for a fraction of a second and sort of eases the load onto the battery. However, the full load still almost immediately transfers to the battery, and you see almost no benefit. [/QUOTE]

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