Power Supply - Mercedes-Benz Sprinter Operator's Manual

Towing a trailer
174
Checking the vehicle and trailer weight
Make sure the weights of the towing vehicle
R
and the trailer comply with the maximum
permissible values. Have the vehicle/
trailer combination weighed on a calibrated
weighbridge. The vehicle/trailer
combination consists 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
! Incorrect wiring of the connector plug
could, under certain circumstances, cause
malfunctions in the vehicle's other
electronic systems. We therefore
recommend having the connector plug
wired at a qualified specialist workshop.
! You can connect accessories with a
maximum 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
electrical installations for trailer towing.
Depending on your trailer, you may need an
adapter to connect 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.
The turn signals on the trailer are only
guaranteed to function when incandescent
bulbs are used.
Further information on the electrical
equipment currently installed on your vehicle
and on installing trailer electrics can be
obtained at any qualified specialist workshop.