Do I Have a Dead Battery or Alternator?

Dead Battery or Alternator?

When you start and run the engine, the battery is responsible for delivering a jolt of electricity to your starter, putting the alternator in action. The alternator then works to charge the battery while your engine runs.

Therefore, if the engine initially starts but then dies immediately, this means there’s an issue with the alternator not properly keeping the battery charged. If instead your car won’t start at all, but can be jump-started, then you’re dealing with a dead battery.

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Warning Signs of a Bad Battery

1. Check engine light: There are many reasons why your check engine light may turn on, including a dying battery. Always consult your owner’s manual when you see this warning sign illuminate and consider getting your battery tested to make sure it’s working at full capacity.

2. Slow to start: Over time, certain components in your battery can wear down and become less effective. This wear can lead to a slower start and is a good sign that it’s time for a new battery.

3. Dim lights: Your battery is responsible for powering all the electrical components in your vehicle. So, if you find that your lights are dimmer or your AC system is weaker, take your car in for a battery check.

4. Visible corrosion: Once a month, you should perform a visual inspection of your vehicle, including its engine. If you see a white buildup on your battery, this indicates there’s corrosion, which may lead to voltage issues and trouble getting your vehicle to start. 

5. Unpleasant smell: A rotten egg smell coming from your engine can indicate that your battery is leaking. This can cause major damage, so seek out your local service center right away.

6. Misshapen case: Extreme exposure to heat or cold can cause your battery case to swell or crack. If you notice the case is oddly shaped, then consider changing out your battery.

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Warning Signs of a Bad Alternator

1. Check engine light: As noted before, a check engine light can warn you about a range of issues, one of which is also a bad alternator.

2. Dim lights: Dim lights can also indicate a problem with your alternator holding a charge within your battery, so have your vehicle inspected if you’re running into this issue.

3. Weak or dead battery: If you’re having issues with your battery, there may actually be a problem with your alternator. If you’re able to jump-start your battery, and the vehicle runs with the lights eventually dimming, you probably need to replace your alternator.

4. Strange smell: Your alternator works in tandem with a system of belts. If there’s an issue, there may be excess friction, causing a strong burning rubber smell. Always have your vehicle inspected if you’re experiencing any unpleasant smells in your vehicle.

5. Unusual noise: There are many components spinning inside your alternator to create an electrical current. If any of these parts wear down or break, you may experience a grinding noise, so seek assistance from your local service center right away.

6. Loose belt: When performing an inspection, check for a cracked, worn, or loose belt. If something appears out of the ordinary, give your local service center a call.

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