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The lowest voltage a battery can drop to during cranking while still starting the car is 9.6v. You can tell a battery's state of charge by the voltage (12.6v is fully charged, 12.0v is low), but the way to tell if a battery is bad is to look at how the voltage changes under load. Most battery testers put a load of half the cold cranking amperage indicated on the battery and look for the voltage to drop below 9.6v, in which case the battery is determined to be bad. Another way to do it at home is to charge the battery at high amperage (can be done by revving the engine slightly and turning off electronics) and, using a voltmeter, look for the voltage to be above 15.5v. This indicates a lower amperage charge than desired and also that the battery should be replaced.
What else can I help you with?
Battery not charging?
battery tests good, alternator tests good, new voltage regulator installed and still no charge to battery from altanator .
What is the problem when your change the alternator and its still not charging the battery?
Obviously check the battery. Anyway, if the alternator, battery, and wires connecting them are good the voltage regulator is next on the list.
Alternator is good battery keeps dying?
have the battery tested, average life of a battery is 2 to 3 years. if battery is good check voltage regulator and starter motor. there is a short somewhere if the battery is good
How do you get a 1998 Honda Accord to start when battery is good but all it does when tring to start is make a small clicking sound?
It sounds like a bad cable connection at the battery/starter solenoid/ or the starter solenoid is bad. Check these areas. It could still be the battery. Check the voltage at the battery then try to start the engine. If the voltage drops below about 10 or 11 volts, the battery does not have enough of a charge. Try a battery charger for a while and see if you can get enough of a charge to start the engine. If the voltage is up when you try to start the engine, check the battery post connections. See if you have voltage THERE when you try to start it. Sometimes a corroded battery terminal will act the way you described. If that isn't it, check the connections to the starter. If you have good voltage to the starter when you try to start it, the starter is probably bad.
How do you tell if a battery is or is not working?
You check the voltage under load. Even a bad battery may have good voltage if no current is flowing, so you need an appropriate "test" load.
What is a battery discharge tester?
It is a meter with a high wattage resistor connected parallel with the meter that drains power from the battery while it is measuring the voltage it is used to test the condition of the battery if the condition is good there will not be a large voltage drop while testing the battery
Can you hook up a charging outlet on a snow machine that does not have a battery?
No. You need a good battery for the voltage and amperage to operate the starter.
What is a good voltage reading for a 12 volt battery?
For lead-acid chemistry, as in a car battery, think 13.6 volts DC.
How do you know if the battery is no good on a 2000 ml320?
Should really charge it then test it with a proper battery load tester. All you can do on your own is get a multimeter and check the voltage. Without it running and having sat for a 1/2 hour or so the voltage should be approx 12-12.5 volts. Start the engine and if the alternator is good the voltage at the battery terminals should be 13-14 volts. If without the engine running the battery voltage is 12 or less this may indicate that the battery is not holding a charge. Even then the voltage should go to between 13-14 volts when engine is started showing that the alternator is working to charge the battery. If when started the battery voltage stays around 12-12.5 volts or less I would suspect the alternator. Just to double check there is the main power out terminal on the back of the alternator. With the engine running check the voltage. If 13-14 volts is present at the alternator but not the battery the circuit in between the alternator and battery is suspect. If the voltage at the alternator is the same as at the battery (12-12.5 or less) the alternator or voltage regulator may be defective.
Will a car keep running if the battery is removed?
Usually yes if alternator is good not a good idea alternator can burn out all your components without the battery to keep the voltage down
If a battery cranks well can it still be bad?
If the battery turns the engine over as it should then the battery is good.
What would cause no electrical function in your 1982 F150 with a good battery and voltage regulatorEngine will turn if silonoid is bypassed but still no electricity. Jason?
sounds like one of your main fuses has blown
