Quick Answer: Can Alternator Drain Battery While Car Is Off?

Does charging your phone overnight ruin the battery?

According to Battery University, leaving your phone plugged in when it’s fully charged, like you might overnight, is bad for the battery in the long run.

It keeps the battery in a high-stress, high-tension state, which wears down the chemistry within..

How do you know if your alternator is draining your battery?

If the engine starts but dies immediately, your alternator probably isn’t keeping your battery charged. If a jump starts and keeps your car running, but the car can’t start again off of its own power, a dead battery is likely your answer.

Is it bad to charge your phone while the car is off?

Theoretically, yes charging the phone while car is off would drain out the battery. But, the drain is so small that it doesn’t even make a difference to the performance of the battery. Moreover, to charge your phone when the ignition is off, one should never rely on the old and shabby battery.

How long does it take for a bad alternator to drain a battery?

Originally Answered: How long can I drive on a full battery but the alternator isn’t working? In the daytime, you can probably drive for twelve hours or so. The only battery drain is the ignition system and your stoplights.

Can you jump a car with bad alternator?

Fortunately, it is possible to jumpstart your vehicle with a bad alternator so that you can get it back on the road and drive it to the nearest auto shop. The vehicle only needs enough electricity to power its onboard computer (engine control unit) and fuel injectors.

What does a bad alternator sound like?

If you’re hearing a grinding sound in your car, this could indicate that the alternator is going bad. The grinding sound may be caused by a worn-out bearing. … If you hear any type of whining or grinding sound that’s a good indication that your alternator needs to be checked.

Do alternators fail suddenly?

When your alternator begins to fail it can cause a variety of different electrical problems in your car, and eventually cause a breakdown. Alternators can go bad suddenly, or slowly over time.

Can a bad alternator drain a battery while the car is off?

Bad Alternator Diodes Alternators with bad diodes can cause battery drain. … When this happens, it may keep the charging circuit on after the vehicle engine is shut off, which will cause the battery to drain.

How far can a car run with a bad alternator?

Starting with a fully charged battery you will probably get 100 Miles before it wears down too far. It also depends greatly on not running headlights or running lights. If you have a car that always runs with the headlights on, and if your battery is several years old, 50 miles might be a better estimate.

What is draining my car battery when its off?

What may drain a car battery when it’s off, however, are things such as interior lights, door lights, or even bad fuses. While your engine runs, the alternator recharges the battery — which is why you typically don’t have to worry about the battery dying while you’re blasting the radio on your drive to work!

What are the signs of a bad alternator?

6 Symptoms of a Failing AlternatorThe indicator light. … Headlights are dim or flickering. … Other electrical failures. … Strange noises. … Car stalls or has difficulty starting. … Battery dies.

How much does it cost to replace alternator?

Waits says the average price to replace an alternator with a remanufactured one is $400, while Gunning adds that a remanufactured alternator on a typical, domestic car, costs about $300 to $500, including parts and labor. The price of a new alternator can run from $500 to $1,000.

How long can a car battery last without the engine on?

two weeksMost car batteries which are in good condition will last at least two weeks without needing you to start the car and drive to recharge it, according to the AA. But if you don’t intend to drive your car for some time for whatever reason, you should still start it up once a week to recharge the 12V battery.

Can a car charger kill your battery?

Even without the phone itself plugged in, leaving the charger itself plugged in will result in unnecessary energy drain as well. In addition to draining your car’s battery, keeping your phone plugged in even when it’s fully charged can lead to issues with your phone’s battery as well.