Hi everyone,
thanks so much for all advices. I checked all You said. At the end found none of above in my ZS. Today I checked all with a meter and I found that alternator was the reason. Voltage regulator had one brush broken in 2/3 of its lenght and bridge rectifier was also really bad condition.
After replacing with a refrubished alternator with a new regulator and bridge everything became to perfection.
Thank for all replies :-)
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