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Message: <blockquote data-quote="shiroitenshi" data-source="post: 1064341126" data-attributes="member: 27518">nope, most cars actually run fine with 14.5v, they were designed to, but they can also run with less voltage. Thats why I said if car, always calculate resistance required based on load using 14.5vThe battery is 12v. It only works to power the ecu, blower fan, lights, accessories, and the starter UNTIL the alternator takes over. The alternator will be the main source once engine starts, and the battery actually becomes a (consumer) or more accurately. a "load" on the electrical system in the car. But this is also not 100% true that all accessories run 14.5v. Do remember that most car sensors runs on 5V, so your ecu does already have circuits to bring down the 12v/14.5v to 5v for the sensors. But never tap these wires for power, as the sensors use resistance/inductance/voltage to measure stuff, and you never ever want to simply add a load on its circuit. Do understand that electronic do work in a "range" of voltages, not a single voltage. most auto specific electronics work up to 15v or 26V (for lorries) You cannot consider voltage inductance and resistance in isolation as they are closely related. Sent from my GT-I9100G using Tapatalk 2</blockquote>

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