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Interesting. So you would say that if I turn off everything and measure the voltage, that would not help. What if the voltage at the cig plug says say 12.5 volts when stuff is turned on, like running an inverter to power the electric fan and a LED lamp and having overhead LED lights on, and maybe a CPAP machine running off 12 volts. Would there be a low limit on voltage, or is that still a useless measurement? And isn't measuring at the cig plug the same as at the battery? And thanks again for answering!
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