Some cars have an external voltage regulator most alternators have internal voltage regulators if your headlights are dim at warm idle tap the gas and they get brighter the voltage regulator is most likely the problem
Could be. But it might be an alternator problem instead of a batery problem. You need a good alternator to keep the bttery recharged. I wouldn't run out and buy a battery without getting the alternator checked.
Check the electrical connections on the wires. Also, make sure that the new alternator is working. It is possible to get a new one that has problems. You might have to remove it and have it checked out. i have the same problem on my intrepid i changed the alt, batt, and still light on i check both alts and the first and second are good.
Sometimes an alternator with a weak diode(s)can test out fine, but can still trigger the light. I believe the problem is in your alternator. Good luck.
Obviously check the battery. Anyway, if the alternator, battery, and wires connecting them are good the voltage regulator is next on the list.
The battery light comes on when the alternator is either over or under charging. If the alternator tested good you have a wiring or computer problem. The engine computer is the voltage regulator.
If the alternator is good and the battery does not charge, then the battery may be bad. There could be problem with the electronics. You will need to take it to a place where they sell batteries. They have equipment to check out the battery and the wiring.
The neutral safety switch could be bad or the ignition switch is bad .
There are times when the alternator will test out fine as far as amp output and voltage output but if your alternator has a weak diode(s) it may trigger the light to go on. I hate to say you should replace the alternator, but your charging system is pretty much self contained in your alternator so I believe the problem is in fact in your alternator. Good luck.
IT IS NOT GOOD FOR THE ENVIROMANT and it causes pollution ad sewage problem.
Perhaps starter is weak. Have it tested for load and drag
Either the alternator/regulator has situation dependant problems such as opens with heat or vibrational malfunctions or there is a problem with an internal charging control in the engine computer
You might have a belt problem with the alternator, good luck!