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Charging issues

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Charging issues
Old June 27th, 2019, 10:08 AM   #1
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Charging issues

I have a 1996 RT/10.

I have a charging issue with my car. So I am very confused on what the problem can be with my car. After I got my Twin Turbo's installed (SCT tuning) I have been having issues with my alternator dropping charge as I drive. So for instance when its all the way cold and I start it, it will charge around 13.5 volts to 14 volts. But slowly it will keep creeping down further and further until its just charging over 12 volts. If I start the car up withing like and hour or two of running it the charging is just low and is around 12-13 volts and again will drop to very low 12's. I have replaced the alternator with a brand new old stock one as well as a 200 amp upgraded new alternator and all of the alternators do the same thing. I have replaced the battery twice, and now got the best Odyssey battery I can get. I have also just replaced the starter (now the starter clicks every now and then and I have to re-turn the key to fire the car up). I am at a loss on what to do or what the problem is. I just tried wiring up an external voltage regulator and it didn't work (maybe I wired it wrong but I followed the directions).

I read that the voltage regulator may be inside the alternator but I also read that the ECU can possibly affect the voltage as well. I have to double check but I feel like I remember seeing the service manual mentioning a battery temperature sensor but everywhere I look it doesn't list that for my car to buy.

Any help would be appreciated.

Thanks,
Scott
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Old June 27th, 2019, 10:21 AM   #2
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I want to say you really have 2 regulators, one internally and in the PCM. the one in the PCM has been known to fail. On my 99, we switched to an external Mopar regulator. So far so good.
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Old June 27th, 2019, 10:48 AM   #3
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Try checking the temp. sensor on the side of the battery. I remember having to take mine off and clean the shit out if it before the car started charging correctly, again. Not sure if the 96 has it, but worth checking.
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Old June 27th, 2019, 12:05 PM   #4
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Originally Posted by 99RT10>S View Post
I want to say you really have 2 regulators, one internally and in the PCM. the one in the PCM has been known to fail. On my 99, we switched to an external Mopar regulator. So far so good.
This was basically my conclusion that it was the PCM but I tried the external regulator hoping it would work but it didn't. I have 3 wires on the back of my alternator as I believe the gen 2's have only 2. I will call the place that I bought the regulator from to see if I wired it correctly (I did use my wiring diagram from the Service manual so it should have worked).

Do you know if the regulator in the PCM can be fixed?

Thanks.
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Old June 27th, 2019, 12:07 PM   #5
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Try checking the temp. sensor on the side of the battery. I remember having to take mine off and clean the shit out if it before the car started charging correctly, again. Not sure if the 96 has it, but worth checking.
I see there is a plug by my battery but it connects to the positive wire and there is nothing on the battery body itself.
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Old June 29th, 2019, 12:55 PM   #6
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If I remember correctly, on mine it was mounted in the back of the battery box itself. Kind of a PIA to get to. When the battery was in place, it pushed up against the sensor.
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Old July 10th, 2019, 01:24 PM   #7
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So I checked and I do not have a battery temperature sensor that I could find. I ended up getting the External Voltage Regulator installed and working (the wires could only go one way, even though the directions said they were interchangeable). Once I installed the Voltage Regulator everything seems to be working fine so it must have been a problem in the PCM. Problem solved. Thank you to the both of you.
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