Merc-O-Tronics 98 - COIL HIGH SPEED TEST; Coil High Speed Test Procedure

COIL
HIGH
SPEED
TEST
12.
If the
coil is
good
on
Coil
power
Test,
preceding,
perform
the
High
Speed
Test.
13.
continue
turning
the
current
control
knob clockwise
to the
right, for
maximum
reading
of met*.
14.
The
spark
gap
should fire
steadily.
15.
If
the
spark is
faint,
intermittent or
no
spark occurs,
the
coil
is
defective
at high
speed and.must
be
replaced.
16.
Complete this test
as
quickly
as
possible
and
immediately upon com-
pletion,
turn
selectot'
switch and
power
control to
,'OFF"
position.
On Fairbanks-Morse
and similar
Magnetos,
it is necessary to
remove
the
distributor cap
and end cap so
single red test
lead
can be
attached
to
secondary terminal
of
coil
"see
Fig.
5".
Small
red test lead
is
attached
to
coil
primary
lead after
the
lead has
been
removed
from breaker
point
terminal.
The
small
black
test
lead is attached to housing
"see
Fig.
5".
When checking
coil on
stator
plate
with crankshaft
type high
inductance
rotating
magnet
(i.e.
Wico, Scintilla and
similar
type magnetos), be
sure
rotating
magneto
is in neutral
position (magnets
not
opposite the coil
core).
NOTE:
When
testing
coils
off
stator
plate,
it is absolutely
necessary
that the
laminated
core be in the
coil.
NOTE:
On Fairbanks-Morse
and
primary
lead
must
be removed from
test.
This
also applies to
all
coils
laminations.
See Figure 5.
similar type magnetos, the
coil
breaker
point
terminal
during this
which
are
permanently grounded
to
Coils
with Two
(2)
Secondarys
Testing,
see
page
28.
Stator
plate
with
2
coils
mounted,
each coil to be checked
separately
as noted
in
Fig.
7.
NOTE:
AII
coils should
start firing
1
to 3
divisions before rated
specifications. Coils
which
first
start
to fire
on
"rated"
specifications
are
considered
marginal
and would
give
considerable trouble
in starting
engine and
should
be
considered
as
defective.