Mercedes-Benz GLA 250 2019 Operator's Manual page 299

Switch off all electrical consumers, e.g. rear window defroster, lighting, etc.
X
Open the hood.
X
Position number B identifies the charged battery of the other vehicle or an equivalent jump-
starting device.
Press together cover : of positive clamp ; and slide it back.
X
Connect positive terminal ; on your vehicle to positive terminal = of donor battery B using
X
the jumper cable, beginning with your own battery.
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
X
jumper cable, connecting the jumper cable to battery of other vehicle B first.
If the battery is fully discharged, leave the battery that is being used to jump-start connected
X
for a few minutes before attempting to start. This charges the battery slightly.
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
X
positive terminal ; and positive terminal =. Begin each time at the contacts on your own
vehicle first.
Close cover : of positive terminal ; after removing the jumper cables.
X
Close the hood.
X
Have the battery checked at a qualified specialist workshop.
X
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 quali-
fied specialist workshop.
Jump-starting
Z
297