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Most likely low voltage from the alternator. A good way to check this is to measure the voltage between the battery terminals when the car is running. You should be seeing roughly 14.5v, and 12.6v when the car is off and the battery is fully charged. Significantly less than 14.5v means that the alternator is either not spinning fast enough (could be due to a worn Spragg bearing, if equipped), or (more likely) a bad diode which leads to not all of the power being transformed to DC. The way to check this, for the fearless, is to put your DVOM in AC voltage mode and check for AC voltage between the charging wire coming off the alternator and the grounded body of the alternator. Any AC voltage means that you have a bad diode and will probably need to get your alternator rebuilt.

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15y ago
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Q: Why is the battery light on in my 04 Honda CR-V?
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