Should give more info. Did they come on at the same time or days apart? Could you have 2 problems not just one? If they both came on together you could have a wiring problem. If it has a sensor for the light in the master cylinder it could just be low on fluid, bad sensor or damaged wiring to sensor. Have you checked the output of the alternator with a digital multimeter? Check it at the alternator first, should be 13-14 volts while running. You can check it at the battery also, again should be 13-14 volts while running.
alternator needs to be replaced. battery also might be a problem due to the alternator not charging it
you may have a bad battery or a bad voltage regulator
This is not a battery problem. Your charging system, the alternator, is not putting out enough juice to charge the battery until you reach 4000 rpm. Have the alternator and charging system checked.
Have the charging system checked. The light comes on when there is a charging system problem. it may be a battery, alternator or a battery problem.
Check all earth connections Have the battery heavy discharge tested (Drop tested)
my 05' cavalier has a bad alternator problem its charging the battery a little bit then stops and the little power my battery has is drained by the end of the night. I replaced the alternator twice and the battery but still no difference.
The PLIP battery on the Peugeot 307 means that the battery is in need of charging. It can also mean there is a problem with the battery cables or the battery needs to be replaced. Not replacing the battery when necessary can also cause problems for the alternator.
You need to check if the ALTERNATOR is giving the correct output so as to charge the battery. By having a volt meter across the batery terminals one can then rev the engine and the voltage accross the battery should be about 13.8 volt indicating that the Alternator is charging the battery. If this 12 volt bateery voltage does not increase, this indicates a charging problem (mostly with the alternator either the brushes or one of the diodes in the alternator).
Charging system problem. Normally this means there is a problem with the alternator.
Obviously check the battery. Anyway, if the alternator, battery, and wires connecting them are good the voltage regulator is next on the list.
i think you are having problem with your alternator its not charging your battery
Your battery is not charging due to a problem with the battery cables or a bad alternator.