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Battery not stay charged

Tiny
KAYKONES45
  • MEMBER
  • 2011 DODGE DURANGO
  • 3.8L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 70,000 MILES
Hello, I changed the alternator and replaced the battery and it still will not keep the charge. I was told it could only be the ECM. Is that correct?
Wednesday, January 2nd, 2019 AT 8:41 AM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

Yes it is possible.

Did you verify voltages at the alternator to be sure you have available power for the alternator to work?

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

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

I attached a diagram for you to view. the TIPM supplies power to the PCM for the field controls for the alternator. make sure there is battery voltage to the two terminals listed with the key on engine off.

Roy

Roy
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Wednesday, January 2nd, 2019 AT 8:53 AM
Tiny
KAYKONES45
  • MEMBER
  • 2 POSTS
You were very helpful. I did check the voltage and it came in at 9 and a weak 10 but kept dropping it would not hold the charge at all.
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Wednesday, January 2nd, 2019 AT 10:54 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Did you charge the battery? The alternator will not work below 12 volts.

Roy
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Wednesday, January 2nd, 2019 AT 4:33 PM

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