Check charging system warning light turns on

2000 BUICK LESABRE
118,000 MILES • 6 CYL • 2WD • AUTOMATIC
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PRODIGAL.S.81
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I've replaced alternator and battery. Had charge system checked all voltage readings are good. Check charge system comes on about fifteen seconds after I start car. I've checked all connections and wiring. Can't figure out why I still get warning light. Any ideas?
Apr 1, 2019 at 2:01 PM
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ASEMASTER6371
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Good evening,

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

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

It is possible you have a bad alternator.

Roy
Apr 1, 2019 at 4:38 PM
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PRODIGAL.S.81
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With load voltage was 14.24 without load 14.40. I put one alternator on it had a bad diode put two on burned up. It had soot on vents. This is the third in one year. No extras in car all factory.
Apr 1, 2019 at 5:24 PM
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PRODIGAL.S.81
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Could the PCM be acting up or does the starter have anything to do with it? Cranking had 11.67 volts and took 1.45s to start which is normal.
Apr 1, 2019 at 5:25 PM
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ASEMASTER6371
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Looks good.

What brand of alternators are you using?

Roy

Apr 1, 2019 at 5:36 PM
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PRODIGAL.S.81
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I believe it is a Duralast rebuilt. From AutoZone has stickers on it but all I found was do and part number.
Apr 2, 2019 at 4:47 AM
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PRODIGAL.S.81
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All I found was D L and part number.
Apr 2, 2019 at 4:48 AM
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ASEMASTER6371
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Okay, I attached a wiring diagram for you to view. Check the fuse listed for power on both sides.

Also, there is a DIM or dash integration module which controls the alternator load.

Do you have a scan tool to monitor the activity of this module?

Roy
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Apr 2, 2019 at 6:00 AM
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PRODIGAL.S.81
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Yes, thank you. I'll check.
Apr 2, 2019 at 8:20 AM
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ASEMASTER6371
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You are welcome.

Always glad to help.

Roy
Apr 2, 2019 at 8:22 AM