I think I would pull the voltage regulator and take a look. Even if thats the problem you probably cant fix it and dont have a spare so maybe get the battery charged up and drive home. I have never needed to do that but you shouldn't have a need for much battery in daylight once you get fired up. Where are you?

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"