2014 Battery Low Voltage Light - Still Charging?

[Tonybain42]

I've got a 2014 RAM 2500 Cummins; I've been getting an intermittent low battery voltage light on the dash.

I have a RaceME Ultra and started watching Voltage on it.

The RaceME supply voltage (from the OBD 2 port) stays about 13.8; the pcm voltage also stays around that.

The dash says 13v on the screen when selected.

It jumps a lot when I select the actual alternator voltage on the raceme.

Is this the alternator possibly going out, or just a bad connection somewhere?

Given that the pcm and battery voltage never drops, I think of a bad wire or connection.

I've Googled for similar issues and only found issues where the alternator isn't charging, but mine is.

Sometimes the light stays on for just a minute; other times it's several minutes.

Any help is appreciated.

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[AK Bob]

I've got a 2014 RAM 2500 Cummins; I've been getting an intermittent low battery voltage light on the dash.

I have a RaceME Ultra and started watching Voltage on it.

The RaceME supply voltage (from the OBD 2 port) stays about 13.8; the pcm voltage also stays around that.

The dash says 13v on the screen when selected.

It jumps a lot when I select the actual alternator voltage on the raceme.

Is this the alternator possibly going out, or just a bad connection somewhere?

Given that the pcm and battery voltage never drops, I think of a bad wire or connection.

I've Googled for similar issues and only found issues where the alternator isn't charging, but mine is.

Sometimes the light stays on for just a minute; other times it's several minutes.

Any help is appreciated.

See the attached charging system operation information and scan for any trouble codes.

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[AK Bob]

@Tonybain42 Also check for loose connections starting with the B+ wire that connects the alternator output to the passenger side battery.

See the wiring diagram attached.

Please keep us posted.

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