Fuses And Relays - Porsche 928 1980 Owner's Manual

Fuses and relays

A failure in the electrical system may be
caused by a burned fuse or a faulty relay.
The central fuse/relay board is located in
the passenger's footwell and protected by
a cover plate.
The relay board holds a row of 34 fuses
along the top edge, numbered 1 through 34.
Underneath are two rows of relays, identi-
fied with Roman numerals I-XXII.
Before replacing a fuse, turn off all elec-
trical components and the ignition; re-
move the key. Replacing a fuse or a relay
62
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 else-
where in the electrical system.
To replace a fuse...
1 - lift carpet in the passenger's footwell and
remove protective cover plate from fuse/
relay board
2 - turn fuses between contact springs until
metal fuse strip faces upward. In a blown
fuse the metal strip is separated
3 - take out blown fuse by carefully depres-
sing the upper contact spring
4 - carefully install new fuse so that the me-
tal strip is visible. The fuse must fit tight-
ly between the contact springs - do not
bend the contact springs
5 - replace cover plate and carpeting.
It is advisable to always carry a few spare
fuses in the car.
Relays
----
rear window defogger
IIIi -
not connected
IV - not connected
V
emergency flasher unit
VI - power window controls
VII -
headlight washer pump
- (where applicable)
VIII - not connected
IX -
not connected
X two-tone horn
XI -
not connected
XII - fog lights
XIII - intermittent wiper speed control
XIV -
bridge (starter relay)
XV -
intensive washer system pump
(where applicable)
XVI - not connected
XVII - fuel pump
X V I I I - extra cooling fan for A/C
XIX
& X X -
retractable headlight relays
XXI - fresh air fan
XXII - defroster
The seatbelt warning system relay is located
behind the radio.
The rear window wiper relay (where applic-
able) is located on the left-hand side behind
the tool kit tray.
The relay for the automatic forward slide
seat mechanism is located under the seat.