Hitachi FDV 20VB Technical Data And Service Manual page 17

(2) For Models without noise suppressor and choke coils
Stop Piece
Connection of the carbon brush terminal and the stop piece
For cord
(brown or black)
Connection of internal wires to the switch
Forward/reverse
changeover section
(White)
(Blue)
(Brown)
(Black)
Insert it with the convex side
faced upward.
Carbon brush terminal
(Black) (Brown)
(Blue)
(White)
(Gray)
(Red)
For cord
(blue or white)
Main switch section
(Red)
(Gray)
Wiring diagram
(Black)
Housing (A) side
(Gray)
Connection of internal wires to the stator
(viewed from the commutator side)
(Brown)
(White)
(Brown or
black)
Cord
(Blue or
white)
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(Red)
Housing (B) side
(White)
(Red)
(Blue)
(Black)
Switch
Cord
Wiring diagram
(Gray)