current problems in the b4 🙁 HHHIILLLLFFEEE!!!!!!!!!!!!

moin hope someone can help me…. so watch out… I got a nice bit through the opposite and once my windows didn’t go up (electric) …. 2-3 min later my radio went out ……. then everything went on strike…. tacho to zero…. tank content on 0 L then no more blinkers went and the light also became darker…. until he finally ran completely round and I had turned it off…… wanted to start it again and then only the reason kli did ckern… 🙁 you might think it’s the lighting machine…. but then I stood for 20 minutes and just tried again … and look… he jumped on as if nothing had been… and everything was okay again…. but then I only let him roll backwards into the garage …. has anyone guessed what that can be???? can be just a lighting machine or battery or do I see this wrong?????? please help am dependent on the car and have no bock for around 4 somewhere to stand on the country road and nothing goes more 🙁 thank you already in advance 😉 lg haubi