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Want to know what a system voltage low means - Cars & Trucks

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ALL modern cars and motorcycles hate low voltage, worst thing you can to to a computer. Your charging system on a car /bike/mower all generally produce 13.5-14.5V from alternator. Good battery will show 12.6-12.8V at rest. Slightly lower will usually still start a vehicle such as atv, motorcycle, but current is the key. If you see your lights dim when you try to start your vehicle it's a sign of a weak battery or corroded connections. Try cleaning connections to your battery, check belt on your alternator to see if it's tight, check acid level in your battery if it's lead acid.

Posted on May 12, 2017

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Posted on Jan 02, 2017

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Explain voltage light on ? Do you mean battery symbol light , charging system ? Low voltage . Have charging system checked

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What is the meaning of system voltage low and can this be fixed and how much will it cost? Thanks


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Upon startup engine idles rough then speeds up and returns to normal idle .After a couple of minutes the volt light comes on then no power then a complete shut down.Starts back up for a while then shuts...


OK, the volt light means that the alternator is not charging the battery. It could mean the battery is shorted out, or the battery is bad or low on charge due to an alternator not charging.

Replace the Alternator and battery as indicated by standard voltage output tests under load.

The computer in the car will not operate the engine properly on low voltage.

Fixing the charging system, may resolve the rough idle (meaning that it may be trying to relearn after data was erased by low voltage of the battery), and the speed up.


Try the charging system first, and once that is repaired, reevaluate the engine driveability and speed and idle smoothness, after it relearns.

Good luck on this repair.

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P1682 - Charging system voltage to low.

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Hi P0157 is
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