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The battery should read 12 volts with the engine off. With the engine running it should read 13.5-16 volts. Any less and the alternator is defective. Any more and the voltage regulator is defective.
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∙ 13y ago
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What would cause my amp gage to read high?
The battery may be low on charge or possibly faulty.
How can you check your car battery with a voltmeter?
With the engine off check the voltage at the battery. A fully charged battery will read 12.6 volts. At 75% charge it will read 12.4 volts, 12.2 at 50% charge, and 12.0 volts at 25% charge. Now start the engine and check the voltage at the battery. It should read 13.5 to 15.5 volts if the alternator is working properly.
Can a car battery be bad if its still pushing 12 volts?
Yes. A fully charge battery will read 12.6 volts with engine not running. A 75% charged battery will read 12.4 volts. At 50% charge, it will read 12.2 volts. At a 25% charge it will read 12 volts, but that will not be enough to even start the engine in most cases and unless the alternator is bad the battery is defective. With the engine running you should read 13.5 to 15.5 volts at the battery. Any less and the alternator is defective.
What should a full charge read on a battery for a BMW?
With engine not running it should read 12.6 volts if it is fully charged. You will need a digital volt meter to check it.
What is normal voltage for automobile battery?
A fully charged battery will read 12.6 volts with the engine not running. It will read 12.4 at 75% charge, 12.2 at 50% charge, and 12 volts at 25% charge. With the engine running at idle you should read 13.5 to 15.5 volts. Any lower or higher and the alternator may be defective.
What is wrong with a car if there is no noise just buzzing and you've had the battery on charge for 1 hr?
Your battery may be to old to even hold a charge. try charging it a little longer and if you have a volt meter ,you should read about 12.5v. if not ,then you need a new battery.
How can you tell if the problem is the battery or alternator?
First use a digital volt meter to check the voltage at the battery with the engine not running. You should read 12.6 volts DC if the battery is fully charged, 12.4 at 75% charge, 12.2 at 50% charge, 12.0 at 25% charge, anything less and the battery is, for all intents and purposes, dead. If it does not have enough charge to start the engine fully charge it with a battery charger. If it will not take a charge it is defective. Once charged start the engine. You should read 13.5 to 15.5 volts at the battery with the engine running. If you read less than 13.5 volts the alternator is suspect and more than likely defective. Or you can just drive the car to your nearest auto parts store where most will check the system for free.
How Long Should You Charge a Motorcycle 6 Volt Battery?
Depends how flat it is and the capacity of the charger and also capacity of the battery. A 6 volt battery fully charged should read about 6.5 to 7 volts when fully charged.
What should battery charger needle read?
That depends on the battery, and the charger. my charger has different settings for higher amps to give a faster charge or jump. A fully charged battery will show 12.6 volts. The charger will read it's maximum amperage if the battery is totally discharged. A fully charged battery will read 12.6 volts with a digital DC volt meter. If it reads 12 volts it has less than 25% charge.
How many volts should your jeep battery be?
A fully charged 12 volt automobile battery will read 12.6 volts with the engine not running and 13.5 to 15.5 volts with the engine running. It will read 12.4 volts with a 75% charge, 12.2 volts with a 50% charge and 12.0 volts indicates a 25% charge.
Do you fit a car battery if the voltage is under 12.4v?
A fully charged battery will read 12.6 volts. A battery reading 12.4 volts is 75% charged. 12.2 volts = 50% charge, 12.0 = 25% charge. You should use a battery charger to charge any battery reading less than 12.4 volts before installing it on the vehicle.
Will a battery still have 12 volts if it is bad?
Yes, a battery with only a 25% charge will read 12 volts. A fully charged battery will read 12.6 volts.
