Folks, Yesterday the three lights at the bottom right hand side of the dashboard began to light up. on my 1983 300D Turbodiesel. These are both brake lights and the alternator light. I drove it, got home, and tested the battery and charging system with a meter from Harbor freight, and it indicated that the battery was charging, as I thought it might be the alternator going out.
This evening, I drove the car after dark, and noticed that not only do these 3 lights stay on, but also the low fuel light (yellow triangle) light also stays on all the time, the tank is more than 3/4 full so I know that is not the problem.
Does anyone know where to look to start diagnosing this problem? It is almost as though some ground loosened up or something, as I don't believe there is anything wrong with the brakes, the tank has plenty of gasoline, and the battery and alternator appear to be fine, so it appears as though these lights on the dashboard are connected to something that has loosened up or something.
Any help is greatly appreciated, thanks so much in advance!

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1983 300D (Hans)