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Message: <blockquote data-quote="loopkiller" data-source="post: 5702089" data-attributes="member: 601690"><p>Depending on the type of load, it may be running primarily off the alt, maybe more off the battery. Steady loads like headlights run 100% off the alt in a stock vehicle. The only time your headlights run on battery power is when something else is using more than the alt output at a given time. So say you have a 100A alt and your stock electrical uses 60A. Your headlights use another 10A we will say. So after turning on your headlights, you now are using 70A. Now you turn on your audio that pulls another 20A minimum, and 50A at peak (bass notes). When that bass note hits, you exceed the output of your alternator by 20A. That remaining 20A of power will be pulled from the battery. When this happens, your voltage in your car will drop and you will see lights dim.</p></blockquote><p></p>

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