Jul 02 2008
How do I know if my alternator is bad?
I have a 1994 Chevy s-10 and my battery light came on. Does this mean I need a new battery and how do I know if my alternator is bad?
Answer:
The battery is most likely fine. The battery light comes on to let you know it is no longer being charged. This is generally an indication of a failing alternator.
Testing : Using a multi-meter set to DC volts, connect the positive and negative leads to the same on the battery with the car’s engine running. You should see from 13.2 – 14.7 volts. If you see less than this and confirm it is the same when the engine is running or not, then you know the alternator is not charging.
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