What is your battery voltage? Take both readings while the engine is running and then with it off (with no lights or accessories on). A simple voltmeter will tell you what you need to know. A fully charged battery should be 12.65 VDC static and around 14.2 VDC running. Lights can look bright even at 12 volts, but at that voltage the battery is only half charged. The light on could mean the alternator has crapped out, internally. A voltage check may or may not reveal the problem, but it's a good place to start.

Michael B.

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Power Generation Specialist.

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We judge others by their actions.