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Battery light stays on

Tiny
HEATH.SHARP
  • MEMBER
  • 2005 FORD ESCAPE
  • 2.3L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
The battery is fine and the alternator is charging but the light is staying on?
Monday, February 10th, 2020 AT 8:15 AM

6 Replies

Tiny
JOETECHPRO
  • MECHANIC
  • 705 POSTS
Hey HEATH. SHARP,

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

Regards, Joe
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Monday, February 10th, 2020 AT 8:33 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
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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Monday, February 10th, 2020 AT 8:39 AM
Tiny
HEATH.SHARP
  • MEMBER
  • 3 POSTS
Hey, the voltage when running is 13.4.
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Monday, February 10th, 2020 AT 3:45 PM
Tiny
HEATH.SHARP
  • MEMBER
  • 3 POSTS
Also she had an alternator put in back around October.
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Monday, February 10th, 2020 AT 3:48 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
It is too low. It should be 14 to 14.5 volts.

Roy
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Monday, February 10th, 2020 AT 4:07 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Try turning on the headlights and see if the voltage drops or raises.

Roy
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Monday, February 10th, 2020 AT 6:19 PM

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