The other day I found my battery completly discharged in the morning.
I completly charged it the car ran fine, alternator charged fine. But, when you turn off the car the battery light on the instrument cluster stays on... What going on?

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1979 300SD Black/Black MBtex239000mi
1983 300TD euro-NA. White/Olive Cloth-MBtex 201000mi. Fleet car of the USA embassy in Morocco
1983 240D Labrador Blue/Blue MBtex 161000mi

Try pulling the voltage regulator off. It's one the back of the alternator. It may be time for a new one. The brushes on a new regulator should be close to an inch long. If they are much less than a half and inch I would put in a new one.

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It's your backout diode aka rectifier. It allows power to flow back through the system when the car is not running. On a W126 a very common side affect is the antenna will stay up (or go up when the battery is re-connected). The part is cheaper than a brush pack -

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