Why does my car battery good but only start with jump?

If jump starting gets your engine started and running, but the car will not start again once you turn it off, the battery is probably the problem. In this case, the alternator is doing its job of keeping the battery going once it has been jumped, but the battery can't hold a charge when the alternator is shut off.

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Why wont my car start unless the battery is jumped?

Charge the battery and clean the terminals and cable connectors to ensure good contact. If your car does not start by jump-starting, you may have a problem with your starter, alternator, or another component of the electrical system.

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Why do I have to jump my car to start it?

After the alternator creates an electrical current, the alternator spreads it to various car components that operate on electricity. Consequently, the battery starts charging. So, the engine needs to run for the belt to turn and the alternator to charge to fire up various car components.

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How do you tell if it's your battery alternator or starter?

If you hear a whine or the sound goes fuzzy when you hit the gas, your alternator is probably failing. If the vehicle won't crank or start but the headlights are still working, look to problems with the starter or other parts of the engine.

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How do you tell if it's your battery or starter?

When you attempt to start the vehicle, is there a clicking sound, but it won't turn over? That may be a good sign. If a jump gets the car running, but won't turn over again once it's shut off, a dead battery is likely the cause.

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Car Won't Start But Battery Is Good - How To Jump Starter Motor Using A Single Wire

28 related questions found

What are signs of alternator failure?

Some warning signs of a failing alternator include:
  • Trouble starting your car.
  • Frequent stalling.
  • Whining or screeching noise after the vehicle starts.
  • Dim or overly bright lights.
  • Smell of burning rubber or wires.
  • Dead battery.
  • Battery dashboard warning light is on.

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What are signs your starter is bad?

Common Signs of a Bad Starter
  • The engine won't turn over. The most common signal that your starter has a problem is if nothing happens when you turn the key or push to start.
  • Unusual noises, such as clinking, grinding and whirring. ...
  • Intermittent problems starting the car. ...
  • Smoke coming from under the hood.

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Are alternators expensive to replace?

Alternators can average anywhere from $100 to $350, depending on the model. In most cases, costs will average between $350−400 for the alternator replacement if no other parts need to be changed. Add another $20 to $50 to your bill if the serpentine belt has to be replaced as well.

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Do alternators go out suddenly?

Alternators can go bad suddenly, or slowly over time. If your alternator is slowly going bad over time there are some warning signs you can look out for.

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Will a bad alternator drain a battery when the car is off?

A corroded or defective alternator diode will faultily continue charging the circuit even when the car off. This, in turn, will drain your car battery and cause the car not to start.

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How much does it cost to fix a starter?

How Much a Starter Replacement Costs. The cost of rebuild parts for a starter can range from as little as $50 to as much as $350. A brand-new starter can range from $80 to over $350. For a qualified mechanic to replace or rebuild your starter, you can expect to pay between $150 and over $1,100.

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Will a bad starter drain your battery?

So can a bad starter drain your battery? The short answer is: Yes, it can. It could also drain the battery even faster if you repeatedly try to start your car with a faulty starter. A faulty starter is also one of the leading causes of battery overcharging.

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How do you diagnose a starter?

How do you troubleshoot starter problems?
  1. Look under the hood. Check the battery and battery cables to see whether everything's in working order. ...
  2. Tap the starter. Try lightly tapping the starter a few times with a hard object, making sure not to pound it. ...
  3. Adjust the transmission. ...
  4. Check the fuel gauge.

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Can you jumpstart a car with a bad alternator?

The answer is simple - Yes, You can jump-start a car with a bad alternator.

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What is the most common alternator failure?

One of the most common problems you're likely to experience with an alternator is a failure in the bearings. There are needle bearings in the alternator that allow the rotor to freely spin inside the housing, and those bearings can break down over time as a result of exposure to heat and dirt.

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How long do alternators last?

Most alternators will last between 80,000 and 150,000 miles — or about seven years. However, your driving habits and the area where you live could wear it out prematurely.

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What can drain a car battery when the car is off?

Parasitic Drain - If the electrical devices in your car or the lights on your car are left running even when your ignition is off, they will suck the juice out of your battery slowly but dramatically. This is often eerily described as parasitic drain.

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How long will a car starter last?

Average car starter lifespan

A car starter can give you around 80,000 starts before you should expect it to struggle, regardless of the mileage you drive. This is around 150,000 miles for some cars, while some starters can last the vehicle's life.

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How long does it take a mechanic to fix a starter?

Due to the complexity of starter motors, the average amount of time it takes to completely replace a starter is generally between 2 and 4 hours. If your car has an easily accessible starter and you take it to a mechanic worth their salt, your time should hopefully be closer to 2 hours rather than 4.

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How often should a starter be replaced?

A starter motor's lifespan varies between automobiles, but you can expect to get about 100,000 miles out of the factory starter. Stringer Auto Repair advises that your starter may start to go bad once the odometer has reached this coveted mileage milestone.

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Does my starter need replacing?

There are several telltale signs that you could be in need of a car starter replacement, including: You hear a whining or grinding noise coming from the starter when you turn the ignition. Smoke is coming from the starter/under the hood. The starter has oil all over it.

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Can a car battery test good but still be bad?

As long as battery voltage remains above 9.6 volts, the battery is considered “good.” But if it drops below 9.6 volts by the end of the test, the battery may be “bad,” or the battery may have to be recharged and retested if it was not fully charged prior to the test.

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Will a bad alternator throw a code?

If you find code P0562, you very likely have a failing alternator (note that codes may vary by vehicle make/model/year). Get it checked out before it fails entirely. If you suspect a failing alternator but don't have a warning light, pop the hood and check the condition of the belt.

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How long will battery last after alternator fails?

If your alternator fails when you're far from home, you can typically drive up to 200 miles on battery power alone. That's assuming your battery is in good shape and fully charged. Of course, it's best to get the alternator repaired or replaced as soon as you can.

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