Shimano GRX RX 815 Series Dealer's Manual page 92

INSTALLATION/REMOVAL
Installing junction [B]
When the battery is a built-in type
Electric wire for battery
4.
Pull in junction [B] toward the down tube side.
When the battery is an external type
(1) Pull in the electric wire on the down tube side.
(2) Store junction [B] inside the down tube and arrange the wires so that only the seat
tube side and chainstay side electric wires are visible inside the bottom bracket shell.
(1)
Electric wire for junction [A]
Electric wire for rear
derailleur
Chainstay
Down tube
Electric wire for battery mount
Seat tube
Electric wire for front
derailleur
(2)
92