Thanks for the fast response!
Due to noise issues we removed the 35Amp alternator and installed a Plane Power 60Amp alternator with integrated regulator. It?s a AL12-EI60/B, baught via Van?s.
The issues was there before, with the old alternator. A slipping belt can be excluded. And yes, it seems that it is only at low current.
Main Bus voltage is at 14.3 V.
If there is a overwhelming noise, would it help to replace the wires from the shunt to the ammeter with shielded ones?
Thanks for the help,
Kai.