Battery light stays on

2005 FORD ESCAPE
150,000 MILES • 2.3L • 4 CYL • 2WD • AUTOMATIC
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HEATH.SHARP
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  • 3 POSTS
The battery is fine and the alternator is charging but the light is staying on?
Feb 10, 2020 at 8:15 AM
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JOETECHPRO
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  • 705 POSTS
Hey HEATH.SHARP,

What is the battery voltage with the engine running at idle?

Regards, Joe
Feb 10, 2020 at 8:33 AM
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ASEMASTER6371
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Good morning,

What is the voltage at the battery with the engine running?

https://www.2carpros.com/articles/how-to-check-a-car-alternator

The voltage is critical. Also, check for any AC voltage as well. It could still be a bad alternator from a bad diode.

Also, verify the fuse I circled for power on both sides. The ECM controls turning on the alternator depending on the load of the car.


Roy
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Feb 10, 2020 at 8:39 AM
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HEATH.SHARP
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hey, the voltage when running is 13.4.
Feb 10, 2020 at 3:45 PM
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HEATH.SHARP
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Also she had an alternator put in back around October.
Feb 10, 2020 at 3:48 PM
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ASEMASTER6371
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It is too low. It should be 14 to 14.5 volts.

Roy
Feb 10, 2020 at 4:07 PM
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ASEMASTER6371
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Try turning on the headlights and see if the voltage drops or raises.

Roy
Feb 10, 2020 at 6:19 PM