Electrical guage not showing a charge

[rocket harlie]

Hi
When I drove my 2002 diesel Ram 2500 this morning, it started out fine. But after a couple of minutes the check Guages light came on and the electrical Guage showed that it wasn't charging. Any one have an idea what is going on?
Thanks in advance-

 

[18CrewDually]

Probably alternator is bad and/or battery. Check voltage with it running when the light comes on. If it's around 12.6 or less then the alternator is probably nit charging.

 

[rocket harlie]

Check the voltage by applying voltmeter leads to the battery, or somewhere else?
Thanks for trying to help.

 

[rzr6-4]

Check the voltage by applying voltmeter leads to the battery, or somewhere else?
Thanks for trying to help.

You can check a number of places but yes the battery is the easiest/most direct.

 

[rocket harlie]

Thanks again rz6-4