ooohhh too much posts,,mmmmm i think you have hydraulic line problem....not electric.
Recheck all the hidraulics,lines,tank,filters and connections,"you have obstruction in some area" and this generate the noise like when you change the sequence ABC or CBA.this means because the pump take air not oil(because have obstruction) and the interior metal in the pump generate the noise.This need minucious check of the hydraulic lines because the pump can stuck inside.