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Sounds like the alternator may not be recharging the battery properly

Use a voltmeter to check

A fully charged battery shoukld read approx. 12.8 without engine running

Should read 13.8-14.2 with engine running with a good alternator

Ford Focus 2001 - My experience with battery light coming on is the following: Put a volt meter on the battery if you get about 12.7 volts DC (Car Cold) or about 14.5 volts DC with the car running, your alternator should be fine. What you want too check is the fuse. In the fuse panel under the hood is a 10 amp fuse (red color) in position 10 (check your manual), if it is blown, that means your voltage monitor/regulator diagnostic module is suggesting it is not functioning. Replace the fuse should help. This also solved some stalling I had with the car, although I'm not sure why.

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βˆ™ 2013-01-19 16:24:46
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Q: Why would battery warning light stay on when driving on a Ford Focus 2005 model?
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