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A faulty alternator can produce the wrong kind of voltage and that would be either too low or not properly converted to DC. Not converted properly would lead to sensors in almost all cars misreading things like temperature, voltage, air flow etc. This can cause engine performance problems. The most common failure though is no voltage which leads to battery charging problems.

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Q: What other parts can be affected by a faulty alternator?
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How can I test my alternator to see if it is discharging my battery?

You can have the alternator tested free of charge at just about any major auto parts store. By the way, a bad alternator will not "discharge" a battery - the alternator's function is to provide the charge to the battery. If the alternator is faulty, then it is not providing the charge necessary to keep other components from discharging the battery. I had the alternator tested and it was charging. If the alternator has a bad diode, it will discharge the battery. I replaced the alternator and everything is fine.


What would cause a battery to drain and not charge with the headlights on but charge up fine with the lights off?

Sounds Like Your Voltage Regulator Is Bad. This Is Inside The Alternator On Most Cars. You May Have To Remove It For A Test. But Lots Of Parts Houses Can Test Unit On The Car. Also Your Battery May Be Weak. Start With The Alternator First. Good Luck The alternator could be marginal. If one or more of the diodes are faulty the alternator will not be capable of producing enough current. You should be able to have the alternator tested at a local auto parts retailer such as checker, Kragen or Auto Zone. If a diode is faulty those tests can certainly detect it.


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If the battery, drive belt and wiring are okay then I would suspect the alternator is faulty. Your local auto parts store can test the charging system for you at no cost.


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Why would an alternator charge too much?

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