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Message: <blockquote data-quote="Prowler573" data-source="post: 901716" data-attributes="member: 561023">12.5v ~ 12.8v is the typical dc voltage present in your car when the engine isn't running.14.4v is standard system voltage with the car running (alternator charging).It isn't a concrete number applicable to every car, mind you, just general guidelines to go by. After having my alternator rebuilt to support my audio gear charging system voltage, both on an external DMM and the voltmeter in my radar detector, shows to hold a steady 14.8v at anything over 1500 RPM no matter what I've got turned on (AirCon, headlights and/or foglights, stereo, etc)The only way to know whether you're showing your amp 12.5v or 14.4v is to have a voltmeter - whether it be a permanently installed one or just using a DMM at the amp's power terminals.</blockquote>

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