Alternators
Car Batteries

What will bad alternator do to a cars battery and lights?

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2010-11-29 17:29:24
2010-11-29 17:29:24

A bad alternator will have the effect of draining the battery, resulting in dim lights, trouble starting the car and the like. It would be best to replace the alternator as soon as possible and possibly obtain a new battery. This may vary depending on how much the bad alternator has drained it. You can get your alternator and battery checked any time at Auto Zone.

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There are several signs that an alternator is going bad. A few signs are dim lights, smell, warning lights, and a dead battery.


A bad alternator will not give proper power to the vehicle. Dim lights, buzz in the stereo or a dead battery could all be causes of a bad alternator.


The diode in the alternator is probley going bad, Check charging system. And replace alternator.


Alternator is going out? battery is going bad?


If your talking about cars... If you smell a burning smell, or your red battery light comes on then i would get your alternator checked out!


A few symptoms and obvious signs of a bad alternator are the battery not charging, dim lights, and a warning light.



Battery light usually means alternator not charging. Most common solutions would be be a bad alternator, bad connection, or loose alt belt.


I obviously means that there is something wrong with the alternator or battery. When both lights are on 80 percent of the time its the alternator. Either your belt fell off or your alternator went bad.


1st you start up the car. Hook up a voltmeter to the battery, and put a load on the battery as the car is running (have the lights on, radio on, high beam on,...) after you put a load on the battery read the voltmeter. if it goes below 12 the alternator is bad. It souldn't be no more than 14 volts. you can also use the battery gauge but to be 100% sure hook voltmeter to the alternator.


bad alternator, bad voltage regulator, bad battery, bad connections.


Bad Battery. Bad Alternator. Lights left on by mistake. Something left running. Exc.



Probably bad but it would need to be checked off of the motor. Some cars have an external voltage regulator, that could be bad. Fuse for the alternator or a fusible link, bad connection at the battery.


a weak battery, weak alternator , just a low idel speed or bad ground


The most common cause for your 1997 Honda Civic lights to dim is a bad alternator. The alternator is not charging the battery. The battery retains a small charge, but not enough charge to run the engine.


run it and then disconnect the negative wire from the battery if alternator dies its bad.


You might have a bad battery, a poor connection between the battery and alternator, or a bad ground from the battery.


More then likely your alternator is bad...But it also depends on what year your vehicle is as well...if its older then it could be the regulator...this tells the alternator how much juice the battery needs...So if your battery is not fully charged then when you hit the lights they will dim and get bright...Best bet..change both battery and alternator..


Either battery or alternator going bad, Advance Auto, or Auto Zone can check this for you! This happened to my truck, but my memory is not to good! More likely the alternator. yeah this happened to me on the freeway, i figured the computer needed to be reset but when the brake and battery lights go on, the alternator is going bad and you might have a half day of driving before it drains your battery



It sounds like the alternator is bad. If the alternator is bad the battery will not hold charge when running


check the alternator for most cars the alternator is wat powers the car the battery is for accesories... a quick check for alternator wit out having to disemble it tunr on ur car disconnect the postitive cable on the battery if car stays on then the alternator is good and the actual battery itself might be bad


Bad alternator and/or belt. Your battery isn't being re-charged while you run the engine, so the electrical things drain the reserve from the battery.


The answer is no . The battery starts you vehicle , the alternator charges the battery so if your alternator is bad your battery is not receiving a charge which will cause a "no start" condition.



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