2008 Alfa Romeo 166 wiring

153
Apart from the electrical branches taken
off for the obligatory signalling devices,
the vehicle’s electrical system can only be
connected to the supply cable for an elec-
tric brake and to the cable for internal
light, though not above 15W, in the trailer.
The electric brake must be directly sup-
plied by the battery through a cable with
a cross-section of over 2.5 mm
2.
INSTALLING TOW HOOK
(fig. 3)
The chart shows the attachment points
for fixing the tow hook to the body.
These points must not be changed irre-
spective of the shape and size of the
hook. For mechanical connection the fol-
lowing must be used:
– “ISO 50” 2nd category ball hook
(CUNA Table NC 138-40)
– 2nd category ball eyelet model “CU-
NA 502” (CUNA Table NC 438-40)
The tow hook structure must be fas-
tened in the points shown by the symbol
Øwith a total of 12 M10 screws.
The inner plate (1) should be at least 4
mm thick.
The side plates (2) should be at least 5
mm thick.
The fastening points (3) must be fitted
with a spacer with a 25 mm diameter
and 6 mm thickness.IMPORTANTIt is compulsory to fas-
ten a label of suitable size and material
(clearly visible) at the height of the hook
ball with the wording:
MAX. LOAD ON BALL 60 kg.
ELECTRICAL CONNECTIONS
The attachment for the trailer wiring
connections are to be applied to the tow
hook support in the most suitable posi-
tion.
For the electrical connections a 13 pole,
12V connection must be used.
For vehicle-trailer electrical connections
contact Authorized Alfa Romeo Services.Do not connect any
trailer services (fan,
fridge, etc.) to the vehi-
cle’s electrical system.
After assembly, the fas-
tening screw holes
should be sealed to prevent the in-
filtration of exhaust gas.
WARNING

181
IF ONE OF THE
INTERNAL LIGHTS
GOES OUT
FRONT ROOF LIGHT
To replace the bulbs (Type B, 10W Halo-
gen):
– Remove the roof light (A-fig. 68)
levering in the point illustrated.
– Remove the screen (B-fig. 69)
firstly releasing it from the catch (C) on
the right and then from the two stoppers
on the left.
– Remove and replace the bulb con-
cerned (D-fig. 70) (tubular with bayo-
net coupling), pushing gently and turning
counter-clockwise.When refitting the roof
light ensure that the
electrical wiring is cor-
rectly arranged and does not in-
terfere with the edges of the
light or retaining clips.
– Refit the screen (B-fig. 69), firstly
inserting the left side under the two stop-
pers then on the right side until the catch
clicks. (C-fig. 69).
– Refit the roof light firstly inserting the
front part, then pressing in the rear part
to fit it in place.
631PGSm632PGSm
fig. 69 fig. 68 fig. 70
607PGSm

223
– If electrical welding is to be carried
out on the body of the vehicle the elec-
tronic control units must be disconnected
or removed if the work involves the pro-
duction of high temperatures.The total absorption of these accessories
(standard and installed later) must be
0.6 mA x Ah (of the battery), as shown
in the table below:
BatteryMaximum permissible loadless absorption
100 Ah 60 mA
You are also reminded that services with
high current absorption activated by the
user, such as bottle warmers, vacuum
cleaners, cellular telephone, mini refriger-
ator, etc. accelerate the battery drainage
process if they are powered with the en-
gine not running.
IMPORTANT It should also be noted
that improper branches on connectors of
the electric wiring for installing additional
equipment is dangerous, particularly if
safety devices are involved.
ELECTRONIC
CONTROL UNITS
With normal use of the vehicle no par-
ticular precautions need to be taken.
If interventions are to be carried out on
the electrical system or emergency start-
ing the following must be heeded:
– Always switch off the engine before
disconnecting the battery from the electri-
cal system.
– If battery charging is necessary dis-
connect it from the electric system.
– When starting in an emergency only
an auxiliary battery must be used and not
a battery charger.
– Check that the polarity is correct and
that the connections between the battery
and the electrical system are sound.
– Before connecting or disconnecting
the terminals of the electronic units en-
sure that the ignition key is not in the
MARposition.
– Do not check for current in the cables
by short-circuiting the ends.
If additional systems are
to be installed on the ve-
hicle the danger of incorrectly tak-
ing branches from the electrical
wires cannot be emphasized too
strongly especially if devices es-
sential to the safety of the vehi-
cle and its occupants are involved
(ignition, injection, ABS ...). The in-
correct installation of radio sys-
tems, electronic theft alarms, ra-
diotelephones etc. can interfere
with the electronic control units and
compromises the warranty cover.
For these interventions we re-com-
mend that you contact Alfa Romeo
Authorized Services.The loadless
absorption of all the accessories in-
stalled in the after market must
not exceed 20 mA (reading with
the vehicle stationary).
WARNING