R
Checkthe maximum permissible gross axle
weight rating of thefront and rear axles
(GAWR), thegross trailer weight (GTW), the
permissible gross weight forvehicle-trailer
combinations(GCWR)and thetrailer drawbar
noseweight rating (TWR).
Trailerpower supply
Incorrect cabling of theconnector plug mayinter‐
fere withother electronic systems in thevehicle.
Mercedes-Benzthereforerecommends that you
have thecabling of theconnector plug carried
out at aqualified specialistworkshop.
Youcan connectaccessories up to amaximum of
240Wtothe permanent powersupply.Donot
charge atrailer batteryusingthe powersupply.
Your vehicle maybeequipped witharangeof
electricalequipment fortrailer operation.
Depending on your trailer,you mayneedan
adapterfor theelectrical connection between the
trailerand your vehicle.
The trailer socketofyour vehicle is equipped with
apermanent powersupply at thefactory.
The permanent powersupply is suppliedvia
trailer socketpin 4.
Note that thetrailer's permanentpowersupply is
notswitched offwhen thevehicle's on-board
electrical system voltageislow.This could com‐
pletely dischargeyour vehicle's starterbattery.
Further information on theelectrical equipment
currentlyinstalled on your vehicle, and on instal‐
ling trailer electrics, can be obtained at anyquali‐
fied specialistworkshop.
Driving and parking
165
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