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<blockquote data-quote="ultimate157" data-source="post: 4671188" data-attributes="member: 566638">The REAL answer is that you have TWO sources of power while the car is running, and one while it is off.When the car is off, the source is the battery.&nbsp; Plain and simple.&nbsp; Negative on one side, + on the other.&nbsp; - is the source, + is the return.When the car is running, you have the alternator providing power as the PRIMARY source, and the battery is your SECONDARY source.&nbsp; A lot of newer vehicles have the alternator run through the fuse box where it is distributed to the electronics, but a lot of older cars have it run straight to the battery.&nbsp; This makes the posts a distribution point for ALL POWER.&nbsp; When the load demand exceeds the supply of the alternator (Current maxed on the alt, voltage begins to fall below the battery&#039;s resting voltage, therefore creating a potential), the battery is brought into the equation as a source and the load is shared.</blockquote>

[QUOTE="ultimate157, post: 4671188, member: 566638"] The REAL answer is that you have TWO sources of power while the car is running, and one while it is off. When the car is off, the source is the battery. Plain and simple. Negative on one side, + on the other. - is the source, + is the return. When the car is running, you have the alternator providing power as the PRIMARY source, and the battery is your SECONDARY source. A lot of newer vehicles have the alternator run through the fuse box where it is distributed to the electronics, but a lot of older cars have it run straight to the battery. This makes the posts a distribution point for ALL POWER. When the load demand exceeds the supply of the alternator (Current maxed on the alt, voltage begins to fall below the battery's resting voltage, therefore creating a potential), the battery is brought into the equation as a source and the load is shared. [/QUOTE]

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