PEUGEOT 508 Handbook page 236

In the event of a breakdown
F Connect the red cable to the positive
terminal (+) of flat battery A (at the metal
elbow) then to the positive terminal (+) of
slave battery B or the booster.
F Connect one end of the green or black
cable to the negative terminal (-) of slave
battery B or the booster (or the earth point
on the other vehicle).
F Connect the other end of the green or black
cable to earth point C on the broken down
vehicle.
F Start the engine of the vehicle with the
good battery and leave it running for a few
minutes.
F Operate the starter on the broken down
vehicle and let the engine run.
If the engine does not start straight away,
switch off the ignition and wait a few moments
before trying again.
F Wait for it to return to idle.
F Disconnect the jump lead cables in reverse
order.
F Refit the plastic cover to the (+) terminal,
if your vehicle has one.
F Allow the engine to run for at least
30 minutes, by driving or with the vehicle
stationary, so that the battery reaches an
adequate state of charge.
If your vehicle has an automatic gearbox,
never try to start the engine by pushing
the vehicle.
234
Charging the battery using
a battery charger
For optimum service life of the battery, it is
essential to maintain an adequate state of
charge.
In some circumstances it may be necessary to
charge the battery:
- if you only use your vehicle for short
journeys,
- if the vehicle is to be taken off the road for
several weeks.
Contact a PEUGEOT dealer or a qualified
workshop.
If you wish to charge your vehicle's battery
yourself, use only a charger compatible
with lead-acid batteries with a nominal
voltage of 12 V.
Follow the instructions provided by the
manufacturer of the charger.
Never reverse polarities.
It is not necessary to disconnect the
battery.
F Switch off the ignition.
F Switch off all electrical consumers (audio
system, lighting, wipers, etc.).
F Switch off charger B before connecting the
cables to the battery, so as to avoid any
dangerous sparks.
F Ensure that the charger cables are in good
condition.
F Raise the plastic cover, if your vehicle has
one, on the (+) terminal.
F Connect the cables of the charger B as
follows:
- the positive (+) red cable to the (+)
terminal of battery A,
- the negative (-) black cable to earth point
C on the vehicle.
F At the end of the charging operation, switch
off charger B before disconnecting the
cables from battery A.