Hi , i have the problem the acceleratie pedaal goes not full power. on the dashbord i set the power from S to P for more power but the trucks start slow and to 1/4 of the power than i press the pedal full but trucks give not more power ,only on the end of the pedal but i think the acc box switch the bypass relay for total battery voltage to drive then trucks drive full speed. Possible the S to P button are defect? I have check the potentio meter in the acc unit but they are oke.

it is a old 48 volt Toyota 2 FB 15 with the hydraulic control on the right side on the floor plate in the black steel box.

any idea what this problem is?