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Why is everyone here talking about voltage? The problem is current. A car battery can have 13 volts but hardly any current. That's why batteries are load tested not voltage tested. In a firehose analogy voltage is the water pressure. Current is the water volume.
The engine takes a lot of volume to turn over where lights take very little.
Ohm's law: E=I x R. Voltage is E, Cuurent is I and Resistance is R.
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