Did that have a little white cover on it? There's definitely one off the end of the battery that is white or has a white cover on it... The red connector may be to power the Live Valve controller ie on the EL 1/0... Failing that there is a light connector up near the head tube under the Ride...
Also, someone was asking about difficulty of removing the Ride Control Ergo (handlebar switch). It is very easy. just pick up the front flap of the Ride Control Ergo from the front edge (it's magnetic) and find a 2mm allen key bolt underneath. Remove this and disconnect the connector for the RC...