All we can do is make suggestions, you'll have to do the testing. Test for voltage when the problem is ongoing. Use a digital multimeter across the battery posts, everything off, the generic spec for a full charge is around 12.6 volts. Then start the vehicle, take second reading across battery posts, the second reading should be higher than the first if the charging system is working.
It could be almost anything.
Thursday, March 8th, 2012 AT 3:00 PM