N
THE ELECTRICAL SYSTEM
Section N.9
WINDSCREEN WIPER WHEELBOXES
Removing
(1)
Withdraw the wiper arms from the wheelbox
spindles, and remove the external securing nuts.
(2)
All
models except Moke.
From
under the bonnet,
slacken the
nut
securing the rack to the motor.
Swivel the wheelboxes through into the engine
compartment sufficiently to enable the securing
nuts to be removed
and
release the wheelbox from
the rack
and
cable. Note the location
of
the flared
ends
of
the Bundy tubing with each wheelbox.
(3)
Moke. Removing is similar to item
(2)
except that
the wheelboxes are located inside the vehicle.
Refitting
(4)
Reverse the removing procedure
and
fit new
external sealing grommets
if
required. Tighten the
rack securing nut
on
the motor.
(5)
Switch
on
the motor and stop it
at
the end
of
the
stroke. Ensure that the arms are correctly posi-
tioned to give maximum wipe area and
park
at
the end
of
the stroke.
Section N.tO
ALTERNATOR SERVICE PRECAUTIONS
The following precautions must be observed when
dealing with vehicles fitted with an alternator.
(1)
When fitting a replacement alternator ensure
that
it
is
of
the same polarity as the original. Terminal
polarity is clearly marked.
(2)
Do
not
reverse the battery connections. This will
damage the alternator rectifiers. Connect up the
earth terminal
of
the battery first.
(3)
If
a high-rate battery charger is used to charge the
battery in position in the vehicle, damage will
occur to the regulator
if
the ignition/starter switch
is
switched
on
to the auxiliary position. Detach
the connectors from the regulator as a safety
measure before boost-charging. Re-connect after
charging.
(4)
When starting an engine with the aid
of
a high-rate
charger, detach the connectors from the regulator
prior
to
using the charger.
Do
not re-connect the
regulator until the charger
is
disconnected, and the
engine is running
at
idling speed.
(5)
The battery must never be disconnected while the
engine is running,
nor
must the alternator be run
with the main output cable disconnected either
at
the alternator end
or
the battery end.
(6)
The cable connecting the battery
and
alternator is
'live' even when the engine is not running. Take
care
not
to earth the alternator terminal
or
the
cable end
if
removed from the terminal.
Do
not make
or
break any connections in the
alternator circuit while the engine
is
running.
N.24
(7)
Disconnect the alternator
and
regulator as a
safety.
precaution when arc-welding
on
the vehicle. . _
Section
N.tt
TESTING
THE
ALTERNATOR CHARGING
CIRCUIT
IN
POSITION
Before commencing the charging circuit tests given
below carry
out
the 'Maintenance' instructions.
Maintenance
The driving belt must be tensioned so
that
a deflection
of
1-
in.
(13
mm.) can be obtained under finger pressure
at
the mid-point
of
the longest
run
of
the belt.
DO
NOT
apply leverage to any point
of
the alternator
other
than
the drive end bracket,
or
run
the engine
with the battery
or
alternator disconnected.
Keep the ventilating holes in the slip-ring end cover
clean. •
Alternator charging circuit
The following procedure should be adopted to locate
a fault in the charging circuit using the test equipment
recommended below.
Test equipment required
(a) Moving-coil D.C. ammeter, accurate
up
to
at
least 60 amps.
(b) Moving-coil D.C. voltmeter, scale 0-30 volts (plus
one
of
low range
if
possible).
(c)
Ohmmeter-battery
powered. Hand-driven genera-
tor
type must never be used for testing diodes.
Testing
(1) Check the driving belt for wear
and
tension (see
'Maintenance').
(2)
Check
that
the battery voltage is reaching the brush •
gear by disconnecting the two cables from the
alternator field terminals, connect a voltmeter
between the two cables
and
run the engine. The
voltmeter should register battery voltage.
If
no
reading is obtained, check the field circuit wiring.
(3) Check alternator output.
Stop the engine
and
disconnect the battery
earth cable
(+).
If
an
ammeter is
not
fitted,
disconnect both connectors from the alternator
main output terminal
'B'
and
connect
up
a moving-
coil ammeter between the terminal
and
the con-
nectors.
Withdraw the cables from the alternator field
terminals and connect a pair
of
auxiliary cables
direct between these terminals
and
the battery
(Fig. N.9).
Re-connect the battery earth lead
(+).
Start
the engine
and
gradually increase speed until the
alternator is rotating
at
4,000 r.p.m.
At
this
speed.
the ammeter reading should be approximately
40 amps.
MINI. Issue
1.
14091
mk1-performance-conversions.co.uk
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