WebNov 23, 2004 · If the 12.21-12.28 V is a dead battery. Junk it. 12.6 isn't all that high so it may not be fully charged. In a car it will flucuate. Your alternator can run up to 15 volts so no it won't damage the alternator. The alternator charges the battery at a constant voltage usually around 14.5V which is how it should be done. WebA 75% charged battery will measure closer to 12.45 volts while anything below 12 volts indicates the battery is effectively discharged. If you get a reading between 12.3 and 12.5 volts and have the ability to charge the …

Car Battery Shows 13 Volts ️ What You Need To Know!

WebDec 28, 2024 · A fully charged car battery voltage (without being plugged into an external device) ranges from 13.7 to 14.7 volts. It will drop to 12.4 volts when the charge is 75% and 12 volts when it is at 25%. A fully … WebMay 26, 2024 · After you read the voltmeter when the car’s ignition is turned partially, now you need to look at the voltmeter while your car is running. While driving the car on the … bouncy fun \\u0026 rental services

Alternator is putting out 16.3 volts - Car Talk Community

WebThere are two things that you are looking for. The charging voltage should be between 13.9v to 14.4v. Also the voltage at the battery and the voltage at the alternator should be within 0.5v of each other. If the voltage at the battery and alternator don't match. For example the battery reads 12v and alternator reads 14v. WebDec 23, 2009 · 15 volts,is a lot,but not to much to worry about,just make sure the connections on the battery are good,and have the battery checked real good,to make … WebSep 5, 2024 · Final possibility (I think), if the battery is reading 12.5v while running with minimal accessories then it could be a bad/weak alternator. Generally voltage at the … bouncy fun inflatables