Not receiving the maximum power from a 8800w generator into a Multiplus II 48/5000/70-50

A similar problem has been reported before (MP II failing to show AC input current), the cause was the the internal current transformer which measures this was disconnected. There’s a 3.5mm jack socket on the board for plugging in an external CT and this can have a bad contact, plugging a 3.5mm plug in and out a few times fixed this.