Porsche 928 S4 – Owner’s Manual |
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Model Year 1987 From
the “Porsche 928 S4 Owner’s Manual”, available from 928 Specialists. |
A
failure in the electrical system may be caused by a blown fuse or a faulty
relay. The
central fuse/relay board is located in the passenger’s footwell and protected
by a cover plate. The use of the fuses and relays is shown in a list on the floor board. Before
replacing a fuse, turn off all electrical components and the ignition; remove
the key. Replacing a fuse or a
relay with the engine running or the ignition on could cause electrical
shock. When replacing a fuse, do not hold fuse by its metal parts. In case of a repeated short circuit, the new fuse will burn out again, causing possible injury. If
a fuse blows repeatedly, do not keep on replacing it. The cause of the short circuit or
overload must be found. On no
account should fuses be patched up with tin foil or wire as this may cause
serious damage elsewhere in the electrical system. To replace a fuse . . .
It is advisable to always carry a few spare fuses in the car. Relays Under
the fuses, there are relay boards attached for various electrical switching
functions. Testing and
replacement of a defective relay should only be done by an authorized Porsche
dealer. The
relay for the rear window wiper is located on the back left, under the tool
plate, the time relay for the seat heater is located under the seat. If you need a circuit diagram, your Porsche dealer will be glad to help you. However, in order to avoid damage to the electrical installation, we recommend having all work, including the installation of electrical accessories, done by your Porsche dealer. The
battery is located underneath the collapsible spare tire in the luggage
compartment. The battery is
accessible after taking out the spare tire. A
replacement battery should always have the same rating as the original
equipment battery.
Specifications are printed on the battery housing. Before work is done on the electrical system, the battery must be disconnected to prevent short circuiting. First disconnect the negative ground wire at body and then the positive cable. To reconnect battery, reverse the procedure. This
precaution must also be taken before charging with a rapid charger, as the
alternator may otherwise be damaged.
Never
drive the car with a disconnected battery as this will damage the alternator. WARNING
Checking the electrolyte fluid level The
electrolyte fluid level in your battery can be checked by unscrewing and
opening the filler vent caps of each cell. The fluid level should meet the indicator mark in each
cell. If necessary, top off with
distilled water. How
often water must be added depends on operating conditions and on the time of
year. Generally, the electrolyte
level must be checked more often in the summer than in the winter, and more
often when driving long distances. Only
fill up to mark, otherwise the electrolyte will overflow when the battery is
being charged and cause damage. Battery care
Winter operation
During
the winter months, battery capacity tends to decrease as temperatures
drop. Additionally, more power
is consumed while starting, and the headlights, heater, rear window defogger,
etc., are used more frequently.
Curtail unnecessary power consumption, particularly in city traffic or
when traveling short distances only.
Let your Porsche dealer test the battery’s capacity before winter sets
in. A well charged battery will
not only prevent starting problems but will also live longer. Battery charging
Automotive
batteries lose their efficiency when not in use. The charge available in your battery can be measured with
a hydrometer. We recommend that
battery voltage be tested by your Porsche dealer who has the appropriate
equipment. If the car is not
driven for prolonged periods, the battery must be charged at least every 6
weeks. A discharged battery
allows rapid formation of sulfates, leading to premature deterioration of the
plates. WARNING
Slow battery charging
WARNING Heed
all warnings and follow instructions that come with your battery charger.
Charger cables must be connected POSITIVE (+) to POSITIVE (+) and NEGATIVE (-) to NEGATIVE (-).
Emergency
starting with jumper cables WARNING
How to use jumper cables
WARNING
Improper
hook-up of jumper cables can ruin the alternator. Always
connect POSITIVE (+) to POSITIVE (+), and NEGATIVE (-) to NEGATIVE (-).
Do not try to start car by pushing or towing. Damage to the catalytic converter, the transmission, and/or other components of the car may result. Start assist connecting points sequence
On
right side of engine compartment you will find a positive (+) battery post
(remote connection). First
connect clamp at end of positive (+) cable to the remote connection in the
engine compartment. Then connect
clamp at other end of positive (+) cable to the positive (+) terminal of the
booster battery. Next
connect clamp at end of negative (-) cable to the negative (-) terminal of
the booster battery. Then
connect clamp at other end of negative (-) cable to the engine compartment
strut rod. Caution:
The cable
clamps must not contact each other, and the plus-cable leading to the
positive (+) post must not contact any metal part of the car. Caution: Do not try to start car
by pushing or towing. Damage to
the catalytic converter and other components of the car may result. |
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