Coil Plate; Exciter Coil; Pulser Coil; Alternator/Lighting Coil - TOHATSU NB-1000 Service Manual

SECTION 7

Coil Plate

5 7
The coil plate is a part to which exciter coil, pulser coil and alternator coil
are attached. (2.5, 3.5 and 5 Hp models do not use the coil plate.) The
coil plate is rotated for ignition advance.

Exciter Coil

5 7
The exciter coil (5) consists of many windings of wire wrapped around
a metal lamination. Once the flywheel exceeds a minimum cranking
RPM, the lines of force from the ferrite magnets contained within the
flywheel cut through the exciter coil windings. This will produce about
100 DVA or over(peak voltage) at cranking speed. A minimum of 100
DVA(peak voltage) at cranking speed must be detected. The output of
the exciter coil provides power to the CD Unit.

Pulser Coil

5 7
The pulser coil (6) consists of an iron core with numerous windings of a
wire wrapped around it. The flywheel is equipped with a metallic cam
called an interrupter molded into it. When the interrupter passes in
close proximity to the pulser coil, the permanent magnet's lines of
force collapse momentarily. At cranking speed this produces a 4.75 to
5.0 DVA signal in the coil. A minimum of 3 DVA must be detected
during testing.
The output voltage from the pulser coil is used to control a small
electronic switch (SCR) located inside the CD Unit. When the CD Unit
receives an output from a pulser coil, it directs an output,
approximately 220 DVA, to the appropriate ignition coil primary.

Alternator/Lighting Coil

5
The larger 1/2 cylinder engines (9.9-40) are provided with an alternator
coil (7) mounted on the coil plate which may be used to power a
lighting circuit and/or recharging circuit if equipped with this option. An
Alternator/Lighting Coil is available as an add-on to the 5 and 8/9.8
models.
7-14
T1982 T1983
T2212
1-/ 2-Cylinder