If neither of those fix the fault, you’ll need to have your alternator and battery tested. If this is lose or broken, it will not charge the battery. You can clean any corrosion with a wire brush. Make sure they are tightly secured to the battery and that they are free from corrosion. Start off by checking the battery terminals. Once you have reached your destination, turn the car engine off. An old car battery Car battery connections that are corroded Car battery cables that are misconnected Dying alternator Failing serpentine belts. It’s advisable to now drive directly to a car service repair station.Though utilities such as interior lights and the stereo use very little power, it’s still best to turn these off and don’t forget anything that you might have plugged into the USB port such as a mobile phone or sat-nav. This should include heater, air conditioning and window demisters being the biggest energy drains. To keep your car going as long as possible, turn off anything in your car that draws power, except of course your lights if you’re driving at night. Depending on the fault, if there isn’t enough electricity being generated, there is the possibility that your car may break down.One of the biggest battery power drains is starting the car. Do not turn your car engine off as you may not be able to restart it if there isn’t sufficient charge remaining in the battery.What to do if the Car Battery Light Comes on The alternator belt can become loose or break preventing the battery from charging If the battery symbol stays on after the engine has started or comes on whilst driving, there is a fault. The battery warning light will come on with the ignition and should go out shortly after the engine has started. Cables and connections – The various cables and connections (including the battery terminals) that link the charging system may have corroded or become loose over time which may cause a connection fault.Voltage regulator – Ensures the alternator provides sufficient power to charge the battery, whilst also ensuring excessive power isn’t produced that otherwise might cause damage.Battery – The car battery stores electricity and is used to start your car and to power various electrical utilities when the alternator is unable to do so.Alternator / alternator belt – The alternator generates electricity and is used to charge the car battery and to provide power to vehicle utilities.
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