I have a 1995 BMW 318i. When I turn on my car the Battery Light turns on, then dims away when driven, why is that? do I need a new battery or alternator?
I would say bad battery not alternator. but do the charging system test as reccoemended above.
It appears that your alternator is failing. Go to the nearest auto parts store and ask them to perform a charging system test and a battery load test. The results of these tests will determine what is needed. Could be a bad alternator, battery, or both.
