Electric Red Swimsuit Red Electric Warning Light Turned On Even Though Key Not Inserted?

Red electric warning light turned on even though key not inserted? - electric red swimsuit

I have an Audi 100GL 1974 (Sweden sold)
In the car the warning light was red electrical failure, even if I did not even inserted the key.

Turn the key in the all-in "mode (the mode just before starting the engine) is the red light disappears, but (as always) turn the lamp oil pressure.

Yesterday he drove the car a shorter route (2x5-6-minute ride) in case of rain, which caused the generator / alternator whine in times.Even While this does not cause the battery to be used during training and the generator, also The red warning light should not be whether the key is always inserted.

All backups are good. Not able to find an obvious short. The water level of the battery are good. As indicators for the work, radio work, try starting the engine rev when you turn the key, but it is not enough power in the battery left.

All tips on what to consider what would be wrong, so very much appreciated.