1996 LAND ROVER DEFENDER service indicator

ELECTRICAL
1
DESCRIPTION AND OPERATION ELECTRICAL EQUIPMENT
Description
The electrical system is Negative ground, and it is
most important to ensure correct polarity of electrical
connections at all times. Any incorrect connections
made when reconnecting cables may cause
irreparable damage to semi-conductor devices used in
generator and regulator. Incorrect polarity would also
seriously damage any transistorized equipment such
as a radio.
WARNING: During battery removal or
before carrying out any repairs or
maintenance to electrical components
always disconnect battery negative lead first. If
positive lead is disconnected with negative lead in
place, accidental contact of wrench to any
grounded metal part could cause a severe spark,
possibly resulting in personal injury. Upon
installation of battery positive lead should be
connected first.
GENERATOR
The generator is a three phase, field sensed unit. The
rotor and stator windings produce three phase
alternating current, AC, which is rectified to direct
current, DC. The electronic voltage regulator unit
controls generator output voltage by high frequency
switching of the rotor field circuit. Use only correct
replacement drive belt. Occasionally check that
engine and generator pulleys are accurately aligned.
It is essential that good electrical connections are
maintained at all times. Of particular importance are
those in the charging circuit (including those at
battery) which should be occasionally inspected to
see that they are clean and tight. In this way any
significant increase in circuit resistance can be
prevented.Do not disconnect battery cables while engine is
running or damage to semi-conductor devices may
occur. It is also inadvisable to break or make any
connections in the generator charging and control
circuits while engine is running.
The electronic voltage regulator employs micro-circuit
techniques resulting in improved performance under
difficult service conditions. The whole assembly is
encapsulated in silicone rubber and housed in an
aluminium heat sink, ensuring complete protection
against adverse effects of temperature, dust, and
moisture etc.
The regulating voltage is set during manufacture to
give required regulating voltage range of 14.2±0.2
volts, and no adjustment is necessary. The only
maintenance needed is occasional check on terminal
connections and wiping with a clean dry cloth.
The generator system provides for direct connection
of a charge (ignition) indicator warning lamp, and
eliminates the need for a field switching relay or
warning light control unit. In the event of bulb failure,
an 'exciter' voltage is supplied through a resistor,
wired in parallel to the bulbs, ensuring that generator
output is maintained. The lamp should be checked
regularly.
When using rapid charge equipment to re-charge
battery, the battery must be disconnected from the
vehicle.

ELECTRICAL
9
REPAIR ALARM SOUNDER RELAY
Service repair no - 86.77.09
Remove
1.Remove screw and lift off LH door check strap
cover.
2.Remove 3 screws and lower wiper motor cover
from fascia bulkhead, (on RH drive models first
remove grab handle).
3.Slide relay multi-plug from retaining bracket and
remove relay.
Refit
4.Secure multi-plug to mounting bracket and fit
new relay.
5.Position wiper motor cover and secure with 3
screws.
6.On RH drive models fit grab handle.
7.Fit door check strap and secure with screw.ANTI-THEFT ALARM INDICATOR LIGHT
Service repair no - 86.45.61
Remove
1.Remove LH front seat cushion.
2.Release retaing clip and remove battery access
cover.
3.Slacken battery negative lead clamp bolt.
4.Turn starter switch 'on'.
5.Turn starter switch 'off' and remove key.
6.Disconnect battery negative lead.
NOTE: Operation 6 needs to be carried out
within 15 seconds to avoid activating
battery backed-up alarm sounder, if fitted.
NOTE: If an alarm sounder without battery
back-up is fitted, it is not necessary to
disconnect battery.
7.Remove steering wheel
See STEERING,
Repair, Steering wheel.
8.Remove 4 screws securing instrument panel to
fascia cowl.
9.Pull instrument panel away from fascia and
disconnect speedometer cable, if necessary.
10.Disconnect alarm indicator light plug lead.
11.Press in retaining lugs and withdraw indicator
light from fascia panel.

86ELECTRICAL
10
REPAIR Refit
12.Fit alarm indicator light into fascia panel and
reconnect plug lead.
13.Reconnect speedometer cable and fit instrument
panel to fascia cowl.
14.Fit steering wheel
See STEERING, Repair,
Steering wheel.
15.Reconnect battery negative lead.
16.Fit battery access cover.
17.Fit LH seat cushion.ALARM SYSTEM FUSE
Service repair no - 86.77.04
Remove
1.Remove LH front seat cushion.
2.Release retaining clip and remove battery
access cover.
3.Slacken battery negative lead clamp bolt.
4.Turn starter switch 'on'.
5.Turn starter switch 'off' and remove key.
6.Disconnect battery negative lead.
NOTE: Operation 6 needs to be carried out
within 15 seconds to avoid activating
battery backed-up alarm sounder, if fitted.
NOTE: If an alarm sounder without battery
back-up is fitted, it is not necessary to
disconnect battery.
7.Remove steering wheel
See STEERING,
Repair, Steering wheel.
8.Remove 4 screws securing instrument panel to
fascia cowl
See INSTRUMENTS, Repair,
Instrument panel.
9.Pull instrument panel away from fascia and
disconnect speedometer cable, main harness
multi-plugs, alarm LED plug lead, heated rear
screen leads, gearbox oil temperature lead and
immobiliser warning light lead.
10.Remove instrument panel.
11.Remove alarm system 15 amp (blue) fuse from
holder located behind starter switch.

ELECTRICAL
13
REPAIR HEADLAMP
Service repair no - 86.40.02
Remove
1.Remove screws retaining side and direction
indicator lamps.
2.Withdraw lamp units and disconnect plugs.
3.Remove 2 screws and withdraw headlamp
finisher.
4.Remove 2 headlamp retaining screws.
5.Rotate headlamp clockwise, disengage from
body, and lift out headlamp.
6.Disconnect multi-plug to release headlamp. On
vehicles fitted with headlamp levelling unit, also
release unit harness plug
See Headlamp
levelling unit.
7.Remove rubber cover.
8.Release spring clip and withdraw headlamp
bulb.
NOTE: Do not touch bulb glass with
fingers. If necessary, clean bulb with
methylated spirits.Refit
9.Fit bulb to headlamp and retain with spring clip.
10.Fit rubber cover and reconnect multi-plug. If
applicable, fit headlamp levelling unit plug
See
Headlamp levelling unit.
11.Locate headlamp in body and rotate
anti-clockwise to engage.
12.Fit headlamp retaining screws.
13.Fit headlamp finisher, side and direction
indicator lamps.
14.Check main beam alignment
See Headlamp
beam alignment.

86ELECTRICAL
14
REPAIR SIDE, TAIL AND DIRECTION INDICATOR LAMPS
Service repair no - 86.40.34 - Front side lamp
Service repair no - 86.40.45 - Tail lamp
Service repair no - 86.40.42 - Front direction
indicator lamp
Service repair no - 86.40.43 - Rear direction
indicator lamp
Remove
1.Remove 2 screws and withdraw lamp unit.
2.Hold bulb holder and twist lens to release.
3.Push and twist bulb to remove from holder.
Refit
4.Fit new bulb, if necessary.
5.Fit bulb holder to lamp lens.
6.Secure lamp to vehicle.SIDE REPEATER LAMP
Service repair no - 86.40.53.
Remove
1.Push lens firmly to the right.
2.Lift left edge and withdraw lamp unit from wing.
3.Twist bulb holder and release from lens.
4.Pull bulb from holder.
Refit
5.Fit new bulb, if necessary.
6.Fit bulb holder to lens.
7.Locate lamp unit in wing and push firmly to the
left to secure.

86ELECTRICAL
20
REPAIR WINDSCREEN WIPER/WASHER SWITCH
Service repair no - 84.15.34
Remove
1.Remove steering column nacelle
See
STEERING, Repair, Steering column nacelle.
2.Disconnect switch multi-plug from main harness.
3.Remove 2 screws and star washer securing
switch to mounting bracket.
4.Remove switch complete with harness.
Refit
5.Fit new switch to mounting bracket.
6.Reconnect switch multi-plug.
7.Fit steering column nacelle
See STEERING,
Repair, Steering column nacelle.
DIRECTION INDICATOR/HEADLAMP/HORN
SWITCH
Service repair no - 86.65.55
Remove
1.Remove steering column nacelle
See
STEERING, Repair, Steering column nacelle.
2.Disconnect 3 steering column switch multi-plugs
from main harness.
3.Slacken clamp screw and withdraw switch
assembly from steering column.
4.Remove fixings and detach windscreen
wiper/washer and main lighting switches from
mounting bracket.
5.Renew complete direction
indicator/headlamp/horn switch and switch
bracket assembly.
Refit
6.Fit main lighting and windscreen wiper/washer
switches to mounting bracket.
7.Position switch assembly on steering column
and fully tighten clamp.
8.Reconnect switch multi-plugs.
9.Fit steering column nacelle
See STEERING,
Repair, Steering column nacelle.