Shimano Ultegra ST-6870 Dealer's Manual page 44

CONNECTION OF THE ELECTRIC WIRES
Connection of the Junction (B)
First pass the electric wires for junction
(A), the battery mount, the front
derailleur and the rear derailleur
through the holes in the frame into the
1
bottom bracket shell.
Connect each electric wire to junction
(B).
2
Connect the electric wire to junction (A), the front derailleur, the rear derailleur, and the
battery mount.
(C)
(E)
3
(D)
(F)
Using the wider end of the special tool TL-EW02,
(G)
attach the electric cable on the cable holder
(H)
(A)
(B)
(I)
44
(A)
Wire holder
The electric wires for built-in use can be
inserted only in one direction.
Make sure that you insert them from the
direction shown in the illustration.
(B)
SM-JC40/41
Junction (B)
When connecting the electric wire, push it in
until it clicks in place.
(C)
SM-EW90-A
Junction (A)
(D)
SM-EW90-B
Junction (A)
(E)
E-tube port ×3
(F)
E-tube port ×5
(G)
Front derailleur
(H)
Rear derailleur
(I)
Battery mount
FD-6870 has a cable holder on the back side.
After connection, attach the cable as shown in
the illustration.
If the electric wire is difficult to attach,
remove the rear wheel.