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Alternator not charging battery?

Tiny
CLAYTONMAYO
  • MEMBER
  • 2008 INFINITI G37
  • 3.7L
  • V6
  • 2WD
  • AUTOMATIC
  • 169,567 MILES
So, I have the vehicle listed above Coupe and I’m having an issue where when driving my battery is not getting charged by my alternator even though my alternator is not faulty and getting power at all connections, it’s like my alternator is getting power but not putting any out.
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Friday, March 24th, 2023 AT 7:53 PM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Hi,

How was the alternator tested? Did you remove it and have it bench tested?

I attached the wiring schematic below of the charging system. I highlighted fusible links and a fuse. Have they all been checked?

Let me know.

Take care,

Joe

See pic below.
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Friday, March 24th, 2023 AT 11:41 PM
Tiny
CLAYTONMAYO
  • MEMBER
  • 5 POSTS
The alternator was removed, and bench tested, I have tried two different alternators brand new (non-refurbished) and a used OEM one. I will get back with you on the fuse links.
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Saturday, March 25th, 2023 AT 12:07 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Hi,

Sounds like a plan. I wanted to make sure it was bench tested. If it is good, then the issue is in the vehicle. I suspect we have a faulty fusible link.

Let me know.

Joe
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Saturday, March 25th, 2023 AT 12:25 AM
Tiny
CLAYTONMAYO
  • MEMBER
  • 5 POSTS
I took a look at the fusible links it does not seem like they are broken in any way at all.
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Sunday, March 26th, 2023 AT 10:02 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Hi,

Sounds good. If possible, let me know what you find. I'm interested in knowing.

Take care,

Joe
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Sunday, March 26th, 2023 AT 7:50 PM
Tiny
CLAYTONMAYO
  • MEMBER
  • 5 POSTS
Hey Joe, I’ve replaced the fusible links but that did not help, the alternator connector is getting power on all 3 wires, the ground is good, I'm just stumped at what this could be. Any suggestions?
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Tuesday, March 28th, 2023 AT 8:53 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Hi,

Okay. We need to test one thing at a time. Start with the B terminal on the alternator. See pic 1 below.

The remaining pics are the diagnostic procedure to test the B terminal. The B terminal is the circuit that sends power to the battery.

Let me know what you find.

Take care,

Joe

See pics below.
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Tuesday, March 28th, 2023 AT 8:33 PM

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