The alternator is most likely the problem,the voltage at the battery,with engine running,and headlights on,and ac on high blower should read 13.65 volts,to 14.25 volts,no less,if it is charging enough,then the diodes in the alternator are most likely going out,and it will finish itself off,replace the alternator.If this was at all helpful,please rate,thank you.
If the battery light is on, this means the battery is not getting charge. check for loose connections ar bad grounds ON to the battery. poor terminals or completely disconected at that.
now if your battery light is on while the brake light is also on , and A. your E-brake is not in use B. your brake fluid is in limits. then you have a problem with your alternator.
causes for this are 1. broken disconected alternator wire.
2. alternator fuse in fuse block underhood (maybey jumped car and inverted terminals. 3. bad alternators.
if both lights are on 90% its the alternator.
if only batery light is on check wiring to and from fuse box to battery and chassis.
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