Normally, during day-time running, when the battery is in good condition, the dynamo
gives only a trickle charge, so that the ammeter reading will seldom exceed 1 to 2 amperes,
i.e. half to one division on scale. The cut-out is an automatic switch which is connected
between the dynamo and the battery. When the engine is running fast enough to cause
the voltage of the dynamo to exceed that of the battery the cut-out allows the battery
to be charged by the dynamo. On the other hand, when the engine speed is low, or
the engine is stationary, the cut-out disconnects the battery from the dynamo, thereby
preventing current flowing back from the battery to the dynamo, a proceeding that
would soon cause the battery to become completely discharged.
The regulator and cut-out are accurately set during manufacture. If, under normal
running conditions, it is found that the battery is continually in a low state of charge, or
is being constantly over-charged, then the regulator setting should be checked by a
qualified electrician and, if necessary, re-set. Whenever possible, this should be carried
cut by a Lucas Service Depot or Agent.
TO REMOVE A.V.C UNIT
The four terminals of the A.V.C. Unit are plainly marked by the letters F.A.D.E. Wires
from F and D go to similarly marked terminals on the dynamo. The A terminal is
connected to one of the ammeter terminals and the E terminal is " earthed."
We specially warn against unskilled meddling with the settings of the regulator and the
cut-out contacts.
Illustration 32
(1) To Earth.
(2) To Terminal D on Dynamo.
(3) To Terminal 3 on Switch.
(4) To Terminal F on Dynamo.
Connections to A.V.C. unit.
The A.V.C. unit is held in sponge rubber and housed in a partition at the rear top corner
of the tool box. To remove it, open the box lid, grasp the unit between the fingers and
thumb of one hand, and gently and firmly pull it out of the rubber envelope.
Battery
The battery fitted is LUCAS. This is a lead-acid battery in which the electrolyte is in
free liquid form. The voltage is 6 and the capacity is 12 ampere hours.
BATTERY REMOVAL
The battery is housed in the front portion of the tool box and retained in position on
its platform by a stout rubber strap.
To remove the battery, release the strap by grasping the metal loop attached to its lower
end, pull downwards until the strap and loop are freed from the retaining clip at the
base of the platform, and allow the strap to go slack. The battery can now be lifted out.
Once every fourteen days, remove the battery, lift off the cover and brush away any
dirt that may have accumulated. Remove the three Vent plugs and check the
electrolyte level and the specific gravity.
NOTE—NEVER bring a naked light near a battery when the vent plugs have been
removed, or when the battery is being charged, as the gas given off by the
electrolyte is highly explosive.
73
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