Shimano SC-EN600 Dealer's Manual page 13

Installation/removal
Electric wires
1. Set the plug of the electric wire to the TL-EW300.
If there is an alignment tab on the plug of the electric wire, check the shape of the E-TUBE port you are
trying to connect to, and set it aligned with the alignment tab.
Without alignment tab on plug
Groove
Guide
With alignment tab on plug
Groove
Guide
Alignment tab
13