The battery is fine and the alternator is charging but the light is staying on?
Feb 10, 2020 at 8:15 AM
Battery light stays on
2005 FORD ESCAPE
HEATH.SHARP
- MEMBER
- 3 POSTS
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JOETECHPRO
- ✓ASE Certified Mechanic
- 705 POSTS
Hey HEATH.SHARP,
What is the battery voltage with the engine running at idle?
Regards, Joe
What is the battery voltage with the engine running at idle?
Regards, Joe
Feb 10, 2020 at 8:33 AM
ASEMASTER6371
- ✓ASE Certified Mechanic
- 52,796 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
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
hey, the voltage when running is 13.4.
Feb 10, 2020 at 3:45 PM
Also she had an alternator put in back around October.
Feb 10, 2020 at 3:48 PM
ASEMASTER6371
- ✓ASE Certified Mechanic
- 52,796 POSTS
It is too low. It should be 14 to 14.5 volts.
Roy
Roy
Feb 10, 2020 at 4:07 PM
ASEMASTER6371
- ✓ASE Certified Mechanic
- 52,796 POSTS
Try turning on the headlights and see if the voltage drops or raises.
Roy
Roy
Feb 10, 2020 at 6:19 PM
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