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1992 Chrysler Le Baron Alternator

Tiny
CUSHIONLUVR
  • MEMBER
  • 1992 CHRYSLER LE BARON
  • 3.0L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 107,000 MILES
I put a new alternator on after the old one stopped working, we check the new one before installing but it wont start charging.
Friday, December 12th, 2014 AT 6:52 PM

19 Replies

Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
Okay, so you did not install the new alternator? You say you checked it before installing at and it does not charge, or you installed the new one and its still not charging?
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Friday, December 12th, 2014 AT 7:06 PM
Tiny
CUSHIONLUVR
  • MEMBER
  • 9 POSTS
I installed it but it doesn't keep the car running and drops from 10volts to 8 in just a few minutes been checking fuses to
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Friday, December 12th, 2014 AT 7:50 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
The voltage regulator for this system is incorporated into the PCM but before condemning the computer you need to test all your fuses with a test light. Also test for power at the main terminal of the alternator with the KEY OFF.
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Saturday, December 13th, 2014 AT 4:09 AM
Tiny
CUSHIONLUVR
  • MEMBER
  • 9 POSTS
No power at alternator with key off, power good at battery
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Saturday, December 13th, 2014 AT 11:18 AM
Tiny
CUSHIONLUVR
  • MEMBER
  • 9 POSTS
No power to alternator with key on either
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Saturday, December 13th, 2014 AT 11:36 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
If that is the main terminal you are referring to, then the fuse in that feed line is burned out. It looks like there is a 60 A fuse in the power distribution box that protects that line. There is also a connector right near the battery for that wire.
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Saturday, December 13th, 2014 AT 11:39 AM
Tiny
CUSHIONLUVR
  • MEMBER
  • 9 POSTS
Where is the power distribution box?
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Saturday, December 13th, 2014 AT 11:47 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
It's the under hood fuse box.
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Saturday, December 13th, 2014 AT 12:48 PM
Tiny
CUSHIONLUVR
  • MEMBER
  • 9 POSTS
I have not found a fuse box under the hood all I have found are a ton of relays that don't have any markings. If I unhook the positive off the alternator and ran a new line would that work or would I fry something?
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Saturday, December 13th, 2014 AT 5:00 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
It has to be a heavy wire and it has to have a large fuse inline, probably 60 to 80 amps.
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Saturday, December 13th, 2014 AT 5:04 PM
Tiny
CUSHIONLUVR
  • MEMBER
  • 9 POSTS
It has a 90 amp alt. Does it feed the power back to the battery? Or is it just the power to the alt? # 2 wire should work right
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Saturday, December 13th, 2014 AT 5:51 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
It feeds power back to the battery. 2 gauge sounds way too big. I would think 10 gauge should be sufficient, This really wouldn't be necessary if you just found the blown fuse or fusible link.
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Saturday, December 13th, 2014 AT 6:06 PM
Tiny
CUSHIONLUVR
  • MEMBER
  • 9 POSTS
Yea I would love to find the fuse or the fuseable link, but for now I will go the other way. Thank you for all your help!
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Saturday, December 13th, 2014 AT 7:12 PM
Tiny
CUSHIONLUVR
  • MEMBER
  • 9 POSTS
I have power to one side of the fields, and the pos. Side of alt. But still not charging. I have not changed anything yet except some fuses
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Monday, December 15th, 2014 AT 9:36 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Try momentarily grounding the Dk Green wire and see if that makes it charge for that time.
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Monday, December 15th, 2014 AT 3:13 PM
Tiny
DANNY KIMBERLIN
  • MEMBER
  • 3 POSTS
Hey guys, 1994 Lebaron 3.0 liter new alternator power to the fields and battery voltage at big wire on alternator can ground the green wire and it charges wide open. So is that telling me the PCM is bad?
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Thursday, February 4th, 2021 AT 2:48 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

I attached a diagram for you. Make sure you have power to the dark blue and the dark green wire at the alternator.

https://www.2carpros.com/articles/how-to-check-wiring

If you do, then you are correct. The ECM is not controlling the alternator.

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

Roy

Removal

1. Remove air cleaner duct from PCM.
2. Remove battery.
3. Remove mounting screws.
4. Remove wiring connector from the PCM.

Installation

1. Connect wiring connector to PCM.
2. Install PCM and tighten mounting screws.
3. Install battery and connect cables.
4. Connect air cleaner duct to PCM.
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Sunday, February 7th, 2021 AT 9:16 AM
Tiny
DANNY KIMBERLIN
  • MEMBER
  • 3 POSTS
Hey, thanks so much for the info. I’ll do exactly as you say and let you know. Again thanks Roy.
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Sunday, February 7th, 2021 AT 1:45 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Roy
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Sunday, February 7th, 2021 AT 1:59 PM

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