Question about 2002 Hyundai Accent

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Battery light comes on after starting but goes out when rpm is increased. I plan on replacing battery tomorrow but would like to know if I should change alternator too.

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After you change the battery, check if you have approx 14v when the vehicle is running. You should have around 13.5 min. Turn on your a/c, lights, wipers and check again. If the voltage is slowly dropping below this rate, your alternator is on the way out.

Posted on Jul 31, 2010

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I have audi A6 2.4 model 2006. When I start the car in morning, the battery sign appears after a couple of seconds. But when I accelerate a bit it goes away. The normal position of the rpm should be about...


Afraid not. Although the light goes out it still may not be charging very little charge will put the light out. the other reason I feel it's the alternator is instead of rpm increasing it should decrease as a properly charging alternator should pull the engine which should decrease the rpm

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Mahindra scorpio crde is having pickup problem.The rpm meter doesn't rise above 2


The RPM meter is fully electronic and when it goes haywire, generally it's a problem with electrical current...
1. Grounding wires
2. Alternator
3. Dying battery

In my case, the alternator became gunked up with oil (from the pump that sprung a leak on the connector) and started destroying itself... the RPM's would be fine, then jump, then show lower than expected...

Check if the battery light periodically comes on very dimly while driving as well (almost for sure an alternator problem then)

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My battery takes a charge but then drains right away.


OK so you have a simple problem so we start with Start and rum to 1000 rpm turn on your lights (main beam) then let it back to idle (dose the lights dim) if no ok NOW go to the battery and check the Pos and Neg terms when you start do either get warm,
As the problem is either bad gharging /or the battery has 1 or more sells down which makes the battery 10 volts and that wont turn the engine over so WHEN YOU NEXT START THE ENGINE RUN FOR 5 Minutes at 1000 rpm and then turn it off then remove the EARTH lead on battery .
Tomorrow re fit the term and try starting if it starts its a dead short like the alternator when stopped will return feed and cause your problem But if it dont start then with the earth lead off the battery has to be replaced ...
Let me know how you get on .
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My 99 cougar stick shift is acting up the Battery


If the alternater output drops when the rpm's increase
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There may be no loss of voltage, but is there a surge of voltage?

As for the battery itself when tested, it should read 12-12.5Volts across the
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Another cause for the battery light could be your ECU has detected an error

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