Mercedes-Benz C-Class 2014 Owner's Manual page 291

Towing a trailer
288
Fitting the adapter
! Make sure that there is sufficient cable
play so that the cable cannot become
detached when cornering.
! Remove the installed adapter cable
before folding in the ball coupling. Other-
wise, damage may occur to the rear
bumper and the adapter cable.
Open the socket cover.
X
Insert the plug connector with lug : into
X
groove = on the socket. Turn bayonet con-
nection ; clockwise to the stop.
Let the cover engage.
X
If you are using an adapter cable, secure
X
the cable to the trailer with cable ties.