battery warning light

Asked by GuruK6WPL Dec 16, 2019 at 05:26 PM about the 2004 Chevrolet Colorado Base Extended Cab RWD

Question type: General

my battery light keeps comimg on and off as i drive and i just changed battery
today

2 Answers
21,875

Gary answered 4 years ago

The battery light can be triggered by a bad alternator. You need to check to see if the alternator Is charging the battery (should raise voltage to 13.0 - 13.5 volts when the engine is running above idle).

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TDolby answered 4 years ago

A battery light always means a charging issue, not a battery problem. With the engine running, probe the battery. Are you getting 14V? If anything lower than 13V I would suspect the alternator is starting to fail. How is your serpentine belt? Sometimes if a pulley is not spinning freely or the belt tensioner is loose, the belt is not properly riding over the alternator.

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