It usually means that your alternator (or generator) is not charging the battery. At this point you need to check system voltage with a voltmeter when the engine is running. You should see at least 13.5 to 14.5 volts. If it is less than that, it is not charging. You can also have the charging checked at a repair shop if you don't have a voltmeter.
with the vehicle running, take a volt meter turned to measure volts and place one lead on each battery post; if the charging system is operating properly, the voltmeter should read between 14 and 15 volts
Check output of the alternator--With voltmeter With engine running readings should be 13.8-14.2 volts lower means probably a bad alternator
The alternator may be failing. Drive to your local auto parts store and they can test the charging system for you for zip.
Dim headlights, Flickering headlights, Starter sounds sluggish when cranking, Battery light comes on or flickers, Voltmeter drops below 13 volts with engine running,
If by charging system you mean battery light then check your battery. It might be dying (or dead). Chances are your car is low on power. Either check and refill the battery with electrolyte (distilled water) or buy a new one. Also, your alternator could be dying. Check that with a test light or a voltmeter.
replace the alternator if your system isn't charging.
You must identify which system among many.......
Check with a voltmeter A fully charged battery should read approx. 12.8 volts without engine running Should read approx. 13.8-142. volts with engine running if higher than this probably a bad voltage regulator
To test the charging system output under high-current draw conditions, you should measure the voltage at the battery terminals while the engine is running and accessories are activated (such as headlights, air conditioning, and radio). This test reflects the voltage output of the alternator under load, ensuring that it can maintain adequate voltage when the system is under strain. A healthy charging system should typically show a voltage between 13.5 to 14.5 volts in this scenario.
OpConnect Electric Vehicle Charging System was created in 2001.
Check charging system with a voltmeter: Fully charged 12.8 without engine running 13.8-14.2 with engine running