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Top Causes of a Dead Car Battery

Electricity stored in the battery of your car is used to get the engine running. The battery, just like the AAs in your TV remote, needs to be replaced at some point, but in most cases a dead battery is the result of another issue within the vehicle. Problems that cause a dead battery can be both operator fault or an issue with another part of the vehicle. If you turn the key and nothing happens, there's a chance a jumpstart will get you up and moving, but what caused the battery to die in the first place?


As mentioned, car batteries do die and need to be replaced at the end of their lifespan. Depending on the type of battery in your car this can range, generally between two and five years.

Leaving Lights On

If you leave the lights on when the car is off it is going to eat up the batteries power. Similarly, if you leave a door ajar and an interior light remains on unknowingly, the battery's power can also be used up.

Using Accessories w/o Engine Running

If you use the radio or other infotainment features with the key in the on position but the engine not running, you're relying on the battery to power the features. This can result in the battery dying, causing you to need to jumpstart the car in order to recharge it.

Failed Alternator

The alternator is what generates the electricity that your car uses when the engine is on. It does so by converting the motion of the engine into power via a belt system. Excess power is stored in the battery. If the alternator fails you will soon lose power to the entire car and it will not start. If you jump the car and then have to jump it again and again, it is probably because the alternator has died.

Stuck Relay

Electrical systems utilize relays that act as an on and off switch. If a relay becomes stuck in the on position it, then that part will remain working, even after turning the car off. Not only will this drain the battery, but it can also damage the part.

If you have experienced trouble with your car's battery it is best to have it tested by a professional technician. For expert car battery replacement in Morgan Hill head to Fred's Foreign & Domestic. We can help you select the right battery for your car at our full service auto repair shop. Anytime you experience car trouble don't hesitate to give us a call at (408) 706-7318 to schedule professional auto repair in Morgan Hill.

Freds Foreign and Domestic Car Repair Blog
Written By Brian Corey
Published By MORBiZ

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