CITROEN C3 Handbook page 59

at least equal to that of the discharged
battery.
The two vehicles must not be in contact with
each other.
Switch off all electricity-consuming equipment
on both vehicles (audio system, wipers,
lighting, etc.).
Make sure that the jump leads are well away
from the engine's moving parts (fan, belt,
etc.).
Do not disconnect the (+) terminal while the
engine is running.
During jump start, extra care should be taken
to ensure right terminals are connected. If
terminal connections are reversed, it will
lead to failure of alternator & other electrical,
electronic components.
Never power electrical or electronic
components directly from battery terminals
as it will lead to poor battery charging, poor
performance of components and battery
sensor malfunction, which will impact fuel
economy.
For Naturally Aspirated engine version
► Lift the cover on the (+) terminal, if the vehicle
has one.
► Connect the red cable to the (+) terminal
of flat battery A, then to the (+) terminal of the
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backup battery B or of the booster.
► Connect one end of the green or black cable
to the (-) terminal of the backup battery B or of
the booster (or to an earth point on the assisting
vehicle).
► Connect the other end of the green or black
cable to the (-) terminal of flat battery A.
► Start the engine on the assisting vehicle and
leave it running for a few minutes.
► Operate the starter on the broken down
vehicle and let the engine run.
If the engine does not start immediately, switch
off the ignition and wait a few moments before
trying again.
► Wait for it to return to idle.
► Disconnect the jump leads in reverse order:
first remove (-) terminal then (+) terminal.
In the event of a breakdown
► Refit the cover to the (+) terminal, if the
vehicle has one.
► Allow the engine to run for at least
30 minutes, with the vehicle stationary, so that
the battery reaches an adequate state of charge.
For Turbo engine version
The negative cable must be connected to
the car ground (not to the battery
negative terminal) so that the battery sensor
can detect all charging and discharging
currents.
► Lift the cover on the (+) terminal, if the vehicle
has one.
► Connect the red cable to the (+) terminal of
flat battery A (at the metal elbow), then to the
(+) terminal of the backup battery B or of the
booster.
► Connect one end of the green or black cable
to the (-) terminal of the backup battery B or of
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