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Very strange charging problem


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Hi guys. I have a charging problem and I am stumped. When I start the car the voltage drops as if the alt is bad. I have replaced the pos and neg battery cables, tried 3 new batteries. I also installed another reman alt. Still no charge. Problem was intermittent for a while. Now it is constant. Yesterday I had my original alt rebuilt. They found a problem with the copper windings and replaced it. I reinstalled this alt and the problem remains. I do notice that my dash is overly bright as if receiving t much power. The dimmer switch is not functioning. I can turn the inside lights on and headlights work but the dimming function no longer works. The only code I get is IPC B1910.... open terminal L I believe. I also removed the headlight switch module but the problem remains. My cruise control stopped working. I am stumped. Can these problems be related? I don't know what to do next. I also verified the voltage at the battery with my volt meter just to make sure the dash reading is accurate. Anyone have any ideas? Connections are clean and tight.

Thanks,

Jim

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  • 3 years later...

I am surprised there are no replies to this thread

What was the resolution to this problem?

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Hi guys. I have a charging problem and I am stumped. When I start the car the voltage drops as if the alt is bad. I have replaced the pos and neg battery cables, tried 3 new batteries. I also installed another reman alt. Still no charge. Problem was intermittent for a while. Now it is constant. Yesterday I had my original alt rebuilt. They found a problem with the copper windings and replaced it. I reinstalled this alt and the problem remains. I do notice that my dash is overly bright as if receiving t much power. The dimmer switch is not functioning. I can turn the inside lights on and headlights work but the dimming function no longer works. The only code I get is IPC B1910.... open terminal L I believe. I also removed the headlight switch module but the problem remains. My cruise control stopped working. I am stumped. Can these problems be related? I don't know what to do next. I also verified the voltage at the battery with my volt meter just to make sure the dash reading is accurate. Anyone have any ideas? Connections are clean and tight.

Thanks,

Jim

I realize that it has been a month, but at any rate the 'open L1' I believe indicates an open circuit to the alternator from the PCM. The PCM controls the field to the alternator. A new alternator will not fix that, it may in the wiring from the PCM to the alternator.

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bigtone, its actually been 3 years not a month. The code relates to the feedback circuit, I think you may be speaking of the F terminal code.

Another member was having the P1910 code and I was attempting to see if the OP ever resolved this. This code permits normal charging

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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that is correct as it does not know how much current is being drawn to accomodate for it so therefore it may overcharge or not charge enough. I would start near the alternator, and I believe there is a splice in the driver side electrical center for it.

GM FAN FOREVER

Nice, clean, luxury= fine automobile

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