Mercedes-Benz E-Class Coupe Operator's Manual page 316

Jump-starting
314
Position number B identifies the charged battery of the other vehicle or an equivalent jump-
starting device.
X
Slide cover : of positive terminal ; in the direction of the arrow.
X
Connect positive terminal ; on your vehicle to positive terminal = of donor battery B
using the jumper cable, always begin with positive terminal ; on your own vehicle first.
X
Start the engine of the donor vehicle and run it at idling speed.
X
Connect negative terminal ? of donor battery B to ground point A of your vehicle using
the jumper cable, connecting the jumper cable to donor battery B first.
X
Start the engine.
X
Before disconnecting the jumper cables, let the engine run for several minutes.
X
First, remove the jumper cables from ground point A and negative terminal ?, then from
positive terminal ; and positive terminal =, each time beginning at the contacts on your
own vehicle first.
X
Close cover : of positive terminal ; after removing the jumper cables.
X
Have the battery checked at a qualified specialist workshop.
i Jump-starting is not considered to be a normal operating condition.
i Jumper cables and further information regarding jump starting can be obtained at any
qualified specialist workshop.