Power Supply - Mercedes-Benz 2016 Metris Operator's Manual

Towing a trailer
168
driver's weight of approximately 150 lbs (68 kg).
The permissible Gross Combination Weight Rat-
ing is vehicle-specific and depends on the equip-
ment level.
When driving with a trailer, you should not
exceed the permitted Gross Combination
Weight Rating (GCWR).
The permissible values, which must not be
exceeded, can be found in your vehicle docu-
ments and on the trailer tow hitch type plates for
the trailer and the vehicle (
basic values approved by the manufacturer can
also be found in the "Technical data" section
( page 305). If the values vary, the lowest
Y
value always applies.
Loading a trailer
!
Utilize the maximum permissible nose-
weight as fully as possible. Do not allow the
weight to fall below the minimum permissible
noseweight, otherwise the trailer may come
loose.
The load must be distributed over the vehicle
R
and the trailer so as not to exceed either the
maximum permissible values for the gross
vehicle weight rating (GVWR) and gross trailer
weight (GTW), the gross combination weight
rating (GCWR), nor the maximum permissible
gross axle weight rating (GAWR) and trailer
drawbar noseweight rating of your vehicle.
Add the drawbar noseweight on the ball cou-
R
pling (TWR) to the rear axle load. This will pre-
vent you from exceeding the permissible
gross axle weight (GAWR).
Add the drawbar noseweight on the ball cou-
R
pling (TWR) to the vehicle payload. This will
ensure that you do not exceed the permissi-
ble gross vehicle weight rating (GVWR).
Checking the vehicle and trailer weight
Make sure the weights of the towing vehicle
R
and the trailer comply with the maximum per-
missible values. Have the vehicle/trailer com-
bination weighed on a calibrated weigh-
bridge. The vehicle/trailer combination con-
sists of the towing vehicle including the driver,
passengers and load, as well as the loaded
trailer.
Check the maximum permissible gross axle
R
weight rating of the front and rear axles
(GAWR), the gross trailer weight (GTW), the
gross combination weight rating (GCWR) and
the noseweight of the trailer drawbar (TWR).
Trailer power supply
!
under certain circumstances, cause malfunc-
tions in the vehicle's other electronic sys-
tems. We therefore recommend having the
connector plug wired at a qualified specialist
page 295). The
Y
workshop.
!
mum power consumption of 240 W to the
permanent power supply.
You must not charge a trailer battery using the

power supply.

Your vehicle may be equipped with various elec-
trical installations for trailer towing. Depending
on your trailer, you may need an adapter to con-
nect the electrical system of the trailer with that
of the vehicle.
The trailer socket of your vehicle is equipped at
the factory with a permanent power supply.
The permanent power supply is on the trailer
socket pin assignment 4.
Note that the permanent power supply of the
trailer is not switched off when the on-board
voltage is low. This can completely discharge
the starter battery of your vehicle.
Further information on the electrical equipment
currently installed on your vehicle and on instal-
ling trailer electrics can be obtained at any quali-
fied specialist workshop.
Incorrect wiring of the connector plug could,
You can connect accessories with a maxi-