ELECTRICAI- SYSTEM
--Dynamo, Control Box
and
Fuses
THE DYNAMO
The dynamo is of the compensated voltage type and operates in conjunction
with the reguiator unit which is housed alongside the cut-out in the control box.
The regulator unit ensures that the dynamo charges the battery at the rate
best suited to its condition. It automatically provides a large charging
current for a discharged battery and a low trickle charge for a battery in
the fully charged state. The cut-out, operated by dynamo voltage, prevents
discharge of the battery through the dynamo when the dynamo is not
charging, in which condition the ignition warning light will be glowing.
Belt Tightness
It is important that the belt is sufficiently tight to drive the dynamo
but not too tight as to put undue load on the dynamo and water pump
bearings. The correct tension is achieved when the belt can be pressed
inwards
:"-
$"
(12 16 mm.) on the longest run,
i.e.,
from the dynamo
pulley to the crank pulley.
THE STARTER MOTOR
Cleaning and Lubrication
The starter brush gear and commutator will not normally require attention.
After 50,000 miles (80,000 km.) however, it is advisable to have the unit
serviced at a Doretti or Lucas Service Depot.
Should the starter pinion become jammed in mesh with the flywheel,
select top gear and rock the car backwards and forwards until the pinion
releases itself. Do not forget to switch off the ignition when carrying out
this operation.
CONTROL BOX
The control box, mounted on the scuttle, houses the voltage regulator and cut-
out. These units are carefully and accurately set before leaving the works and
must not be tampered with.
FUSES
The fuse carrier is located near the control box and houses two operating
and two spare fuses. The top fuse (50 amp.) protects the horn, while the other
fuse
(35
amp.) protects those items which can only operate when the ignition
is switched on,
i.e.,
direction indicators, windscreen wipers, brake light,
petrol gauge and heater (if fitted). When replacing a fuse, it is im-
portant to use the correct replacement
;
the fusing value is marked on a
coloured paper slip inside the tube.
A blown fuse will be indicated by the failure of all the units protected by it
and is confirmed by examination of the fuse. If it is not possible to locate the
cause of the trouble and the new fuse blows immediately, the equipment
should be examined by a Doretti or Lucas Agent or Service Depot.
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