Alternator defective. Can one only exchange the coals????

Hello dear community Today my batrie lamp started.This morning, car set off 10min and then drove again. after the start the light didn’t turn off, even if I gave gas. had to drive a few km. at once the TC, ABS, AIRBACK light went on and the ventilation didn’t want any more. the incurrent duck lighting would also become weaker and weaker. get out of it that the lima has not supplied any more power. or could it be that the batt erie schluss got now?. read here that the current salt on the str could be to blame. but there was from the slight flattening of the lamp the talk and not like with me. wants to measure tomorrow times the charge voltage when I get the car again. battery is now drawn empty or stop in the A….If it should still be the Lima, can you just exchange the charcoal there, like before, or is it so installed that you can’t get there anymore?… would it be quite easy for me? like to save the cost… mfg