Porsche 911 Carrera - Manual (Page 302)

Emergency Starting with Jumper
Cables
General information
If the battery is discharged, e.g. in winter or after
the car has been parked for a long time, the battery
of another car can be used for starting with the
help of jumper cables. Make sure the voltage of
both batteries is the same. Both batteries must
be 12 volt types. The capacity (Ampere hours, Ah)
of the booster battery must not be substantially
less than that of the discharged battery. The
discharged battery must be correctly connected to
the vehicle’s electrical system.
Please observe the chapter ”BATTERY” on
page 295.
Please observe the chapter ”EMERGENCY
UNLOCKING OF THE LUGGAGE COMPART-
MENT LID” on page 294.
Note
Do not try to start the car by pushing or
towing. Damage to the catalytic converters
and other components of the car may result.
Warning!
Risk of short circuit, damage and explosion,
resulting in serious personal injury or death.
Use only jumper cables of adequate diameter
cross-section and fitted with completely
insulated alligator clips.
Follow all warnings and instructions of the
jumper cable manufacturer.
When connecting jumper cables, make sure
that they cannot get caught in any moving
parts in the engine compartment. The jumper
cables must be long enough so that neither
vehicles nor cables touch another.
The vehicles must not be in contact, otherwise
current might flow as soon as the positive
terminals are connected.
The cable clamps must not be allowed to
contact each other when one end of the
jumper cables are connected to a battery.
Ensure that tools or conductive jewelry (rings,
chains, watch straps) do not come into contact
with the positive jumper cable or the positive
battery post.
Improper hook-up of jumper cables can ruin
the alternator.
Warning!
Danger of caustic burns.
Do not lean over the battery.
Warning!
Danger of gas explosion.
Improper use of booster battery to start a
vehicle may cause an explosion, resulting in
serious personal injury or death.
Keep sources of ignition away from the
battery, e.g. open flame, burning cigarettes or
sparking due to cable contact or welding work.
A discharged battery can freeze even at
23°F /-5°C . Before connecting jumper cables,
a frozen battery must be thawed out.
Connect jumper cables in the following
sequence:
Always observe the sequence below:
1. Connect the positive lead (red) to the
positive terminal of the discharged battery
first, then connect it to the positive terminal of
the donor battery.
300
Practical Tips, Emergency Service