AJS 350 1954, Maintenance Manual And Instruction Book, Page: 82 / 96

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
out by a Lucas Service Depot or Agent.
The A.V.C. Unit is retained by two bolts with self-locking nuts. The self locking
nature of the nuts prevents subsequent slacking off. 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.
Later machines may be fitted with a new A.V.C. Unit type RB-107, but the foregoing
notes will still apply with the exception of terminal grouping which will be F.A.E.D.
Battery
The battery fitted Is LUCAS type PU7E/9 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.
Maintenance once every 14 days
Remove battery cover, brush dirt from top of battery and remove vent plugs. (There
are three vent plugs.)
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.
Illustration 32
Showing connections to regulator
and cut-out unit Type
MCR-2
TO EARTH
TO TERMINAL D
ON DYNAMO
TO TERMINAL 3
ON SWITCH
TO TERMINA L
F ON DYNAMO
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