Help!!! Audi 80 B3 no longer charges battery and electrics spins

Hello, I need urgent help!!! My Audi is totally spinning around, the first signs were that he did not always want to start immediately despite a brand new battery. Was it then on you could watch that when one had light on and consumers like rear heating, fog funnel, ventilation has turned on the headlights getting darker. Ok went a few weeks like that. Then I had a total failure on the way, noticed how headlights, speedometer light and ventilation became weaker and my Benzi nanzeige wanted to tell me that my fuel is empty (which was of course not the case), when he was out of it. Did bridge him and drive home, then again did not go on without help. Then tried it again because after bridging again everything correctly indicated and had juice. I drove a short distance then he started the stinking, smelled spilled. Then we put in another alternator in the hope that the Mistake was, but unfortunately it wasn’t the case! Came about a mile, then the battery that we had charged was empty again. But a few new phenomena were added: Oil, water and battery lights flashed like crazy while engine was still running, rev counters jumped up and down from 2000 to 0 and backwards without the speed actually changing. Yes and gasoline display also makes such jumps empty half full etc. Who knows the problem??? Because Lima and battery can’t nic I’d be happy if someone could help me… Mfg