Griso under seat electrical connectors

Hi, whilst attaching my ctek charger lead to the battery I noticed two electrical connectors next to the small fuse box under the seat, one is white and is open (i.e. ready to accept the other half) with a blue and yellow wire, and the other is black, with a cap on it to I assume protect the connectors, also with a blue and a yellow wire?
Can someone please enlighten me as to their purpose?
Thanks