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Charging System, alternator not charging the battery, can I get a charging circuit diagram?

Tiny
PDD3
  • MEMBER
  • 2010 DODGE RAM
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 239,000 MILES
New PCM, new alternator, and a new battery.
Had the alternator bench tested it shows it's good but so does the one I replaced. I'm not getting my alternator to charge my battery. The wire coming from the battery has 12.4 volts which is the same as my battery. I can't find a charging circuit diagram anywhere. I don't know what else to check.
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Thursday, August 4th, 2022 AT 7:58 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,268 POSTS
Hi,

As you are likely already aware, the regulator for the system is an integral component of the PCM. Even though the PCM is new, it could be bad. However, before we jump to that as the issue, I need a little info.

First, have you checked the fusible link? Also, do me a favor. Try this test and let me know if there is any change in voltage when the engine is running:

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

Additionally, I attached the charging system schematic below for you to reference.

Let me know what you find.

Take care,

Joe

See pic below.
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Thursday, August 4th, 2022 AT 10:03 PM

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