Charging system voltage low

Hello and have you tested the voltage at the battery with a voltmeter should be right around 13.5 to 14.3 volts if it less then this at anytime the check charging will come on to tell you the voltage is low output to the battery witch if it does drop the problem is usually the voltage regulator. Also the reason if it is on and then you shut it off and restart the light goes out is because you have just pulled a bunch of power from the battery to start the vehicle so the regulator opens up to full charge to replace the power loss. but could be a problem once the voltage gets back to normal the regulator doesn't know what voltage it needs to maintain so it just stops charging instead if trickle charging

with the engine running use a volt meter to check battery voltage with the head lights on, should be around 14 volts on a 12 volt system, if 12 volts or less the regulator or alternator is at fault . if around 14 volts there is a drain or short, the battery could also be faulty.

It;s either a bad alternater or battery connection. Check battery connection first. If that isn't it go to auto parts store. Most of them will check your battery & alternater for free.If it's the battery, most of the stores will install it for free( I usually give them a 3 or 4 dollar tip, it's worth it). If it's the alternater, buy a new one,usually under $100. Some auto parts stores will lend you the tools to replace it. Normally takes less than 30 minutes to do it.

Suggest you to vehicle charging circuit for a thorough examination.
The first is to measure the battery tester, suggest you use high frequency discharge gauge or battery measurement, the load current is less than 110 of the cases, the minimum voltage shall not be less than 9.6 volts, and remained stable in 5 seconds. If the voltage below 9.6 volts, but can keep stable inside said in 5, excessive discharge, should be timely supplementary charge; if the voltage below 9.6 volts, to maintain stable and rapid decline to 0 volts or close to 0 volts in 5 seconds can not, indicates that the battery failure.
Then check the generator power output, recommend looking for car condition with a multimeter in parallel with the positive and negative poles battery, the output voltage and stepped on the gas check generator in high speed condition is in the 14V positive and negative 0.25V or so, if the lower or higher than the standards, then the generator failure. Use obd2 tools for automotive diagnostics , you can improve vehicle safety performance and driving more safer.

you may have to take a magnet and put it over the speedometer needle and move the needle back to zero,this some times happens when a battery is connected as the voltage surge causes the needle to bounce some times to far and its not able to return to zero.you may need to have the system checked for proper charging,the voltage could be borderline causing the light to come on.you can try disconnecting the battery as it may reset the light.

If the battery light does not come on that doesn't mean the alternator is good.

If when you first turn the ignition key on and the car is not running, the battery light should go on to test the alternator. This is wired directly to the alternator circuitry.

When you start the car and it is running, this light should go out in a few seconds.

This indicates that it is charging the battery or supplying enough voltage to the car's system to keep it running.

If the battery light never goes on, the alternator is bad.

It will be the alternator that is the problem,the gauge would show charging but the battery light would come on if it was just the battery,most likely the problem.The best way to tell,is have the charging system checked at the auto parts store,they will do this for free,but it will be the alternator,if this was helpful,please rate thank you.

Usually when the battery light comes on it means there is a problem with the alternator. It means it is putting out less than 12.2-12.5 volts.

is the altinator putting out voltage ?

posibly a bad ground or battery