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Diagnosing Car Electrical Problems

By Ben Mester

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Published: 14Feb2011
Word count: 540
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Even though cars are run on gasoline, there are still a wide variety of electrical systems needed in order for a car to start and run properly. A kink in one of these systems will stop you in your tracks. You can't go very far with a dead battery, but in the world of electrical problems, a dead battery is about the least of your problems. There are at least 4 separate electrical systems required just to be able to start your car. If any one of them fails, you won't be going far. This article aims at helping you to identify the different electrical systems in your car and some tips to identify which one is failing and giving you problems.

Let's start at the beginning. When you go to turn on your car, the key slides into the ignition and the ignition sends a signal to the solenoid which closes the circuit between the battery and the starter, allowing a high level of voltage to flow from the battery to the starter and start the car. After that happens, the alternator takes over the powering of most of the electrical systems and also begins to quickly recharge the battery for the next time you'll need to turn on the car. The spark plugs and coil provide combustion for the fuel air mixture and the car runs efficiently. If any of these systems becomes faulty or breaks, you'll have some big problems on your hands.

So here are a few tips for finding out which electrical problem you might be having. If your car is completely unresponsive when you turn the key, but your headlights still work, then you most likely have either a bad starter or solenoid. The battery still has power because your headlights still function, but the power can't get to the engine to turn it over because of a bad starter or solenoid. If the car is unresponsive when you turn the key and the headlights don't come on, then you might have a loose connection on the cables that attach to your battery, or you may have enough corrosion that power can't flow from your battery.

If your car responds when you turn the key but you don't have enough power to turn on the car, then you most likely have a bad battery. This doesn't necessarily mean that you have a completely bad battery, because sometimes if you leave a car sitting for a period of time without driving it, the battery can wear down and lose power. This doesn't mean that the battery is bad and it should run just fine once you jump start your car and recharge the battery. If however, you have been driving your car consistently and your battery isn't starting your car anymore, it may well be that you need a new battery. Batteries wear out every few years and won't hold a good charge anymore. If you haven't bought a new battery in a few years and you're having trouble starting your vehicle, you most likely will just need to buy a new battery. I hope this helps.

I hope these tips helped you identify your electrical problems. If you want to read more about the subject, check out my articles on alternator problems and car battery problems.

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