ELECTRICAL SYSTEM
H
TESTING
The efficiency of a
stored
capacitor
can
be
determined
fairly
accurately
with
the
aid of a
voltmeter
(scale
0-12
volts)
connected
to
the
terminals of a
charged
capacitor
and
the
steady,
not
instantaneous
reading
on
the
meter
noted. The
procedure
is
as
follows:-
(a)
Connect
the
capacitor(sl
to
a 12-volt
supply
and
leave
connected
for 5
seconds.
Observe
carefully
the
polarity of
connections,
otherwise
the
capacitor
may
be ruined. .'
(b)
Disconnect
the
supply
leads
and
allow
the
charged
capacitor
to
stand
for
at
least
5 minutes.
(c)
Connect
the
voltmeter
leads
to
the
capacitor
and
note
the
steady
reading,
This
should
not
be
less
than
g.o
volts
for a
serviceable
unit
If
the
reading
is
less
than
9.0
volts,
the
capacitor
is leaking
and
must
be
replaced.
If
a
voltmeter
is
not
available a rough check
can
be
made
by following
the
procedures
in
(a)
and
(b)
and
using a
single
strand
of
copper
wire
instead
of
the
voltmeter
to
short-circuit
the
capacitor
terminals.
A
good
spark
will be
obtained
from a
serviceable
capacitor
at
the
instant
the
terminals
are
shorted
together.
WIRING AND
INSTALLATION
The
capacitor
is
fitted
into
the
spring
and
should
be
mounted
with
its
terminals
down-
wards. The
capcitor
negative
terminal
and
Zener
Diode
must
be
connected
to
the
rectifier
centre
(D.C.)
terminal
(brown/white),
and
the
positive
terminal
must
be
connected
to
the
centre bolt
earthing
terminal.
The mounting spring should be
attached
to
any convenient point near the battery carrier.
SERVICE NOTES
Before running a 2MC equipped machine with
the
battery disconnected
it
is
essential
that
the
battery negative lead be insulated to prevent it
from reconnecting and shorting
to
earth
(frame of machine). Otherwise, the capacitor
will be ruined. This can be done
by
removing
the fuse from its holder and replacing
it
with a
length of
Ii
in.
dia. dowel rod
or
other
insulating
medium.
A faulty capacitor may not be apparent when
used with a battery system. To prevent any
inconvenience arising, periodically check
that
the capacitor
is
serviceable by disconnecting
the
battery to
see
if
the
machine
will
start
and
run
in
the normal manner, with full lighting
also available.
WARNING
Do
not run the machine with
the
Zener Diode
disconnected,
as
the
2MC capacitor
will
be
damaged
due to excessive voltage.
Should the engine fail
to
start
without the
battery, substitute a
new
2MC capacitor.
If
the
engine still refuses to start, check the wiring
between
the capacitor
and
rectifier for
possible open or short circuit conditions. Also
check the earth connections.
If
difficulty
is
encountered
in
starting with
a battery fitted, disconnect the 2MC capacitor
to eliminate the possibility of a
short
circuit
H21
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