Can you help me diagnose my charging system malfunction please?

Tiny
SOLARNATE
  • MEMBER
  • 1991 PLYMOUTH ACCLAIM
  • 135,000 MILES
The alternator and battery test good, but the battery receives NO charge from the alternator. I replaced the ECM with a salvaged one, the results were the same so I switched the old one back.I've identified a short circuit in fuse 2. All of the wires under the dash and in the engine compartment look good, grounds and connections appear tight with little corrosion. I've been doing continuity tests with a haines manual, everything looks good so far. Any suggestions, or do you know where I can find a more detailed wiring diagram?
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Saturday, April 28th, 2012 AT 6:14 PM

6 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Do you have 12 volts to the back of the alternator? If you have identified a short circuit in fuse 2 and have tested the wires and connections with a continuity test, but are still experiencing issues with the alternator not charging the battery in your 1991 Plymouth Acclaim, here are a few suggestions:

Focus on the specific circuit: Since you have identified a short circuit in fuse 2, concentrate your efforts on tracing and inspecting the wiring associated with that particular circuit. Pay close attention to any wires, connectors, or components connected to that circuit, as a short circuit can disrupt the electrical flow and prevent the alternator from charging the battery.

Double-check connections and grounds: Even though the connections and grounds appear tight with little corrosion, it's worth rechecking them to ensure there are no loose or damaged connections. Pay close attention to the alternator connections, battery terminals, and ground points, as they play a crucial role in the charging system.

Consult a more detailed wiring diagram: For a more detailed wiring diagram than what is provided in the Haines manual, you can try accessing a factory service manual for your specific vehicle model and year. These manuals often provide comprehensive wiring diagrams and detailed electrical system information. You may find these manuals at auto parts stores, online marketplaces, or by searching for downloadable PDF versions specific to your vehicle.

Roy
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Saturday, April 28th, 2012 AT 6:17 PM
Tiny
SOLARNATE
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  • 4 POSTS
I think my voltage at the back of the alternator was a little higher, I'll check again tomorrow. I'm also planning on checking the fusible links and running more continuity tests.
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Sunday, April 29th, 2012 AT 3:47 AM
Tiny
SOLARNATE
  • MEMBER
  • 4 POSTS
I found 12.4 Volts on one of the connections at the back of the alternator (to the - terminal), the battery voltage was 12.75 at the time.
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Sunday, April 29th, 2012 AT 7:58 PM
Tiny
MAURICIOTAN
  • MEMBER
  • 1 POST
Here is the alternator wiring diagrams. Check out the images (Below). Please let us know what happens.
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Tuesday, May 8th, 2012 AT 11:01 AM
Tiny
SOLARNATE
  • MEMBER
  • 4 POSTS
Thank you I found the fusible link was bad.
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Tuesday, May 8th, 2012 AT 2:37 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
Thanks for letting us know, we are here to help, please use 2CarPros anytime.
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Tuesday, May 8th, 2012 AT 2:58 PM

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