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Modification
to protect electronic ignition
against
ignition switch faillure.
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Explanation
of the problem :
To stop an engine equiped with a Magneto ignition system, a ground
is usually send to the stator of the magneto. This kill the pulses
send to the ignition coil so stops the engine.
One
problem that happened some time is, if the ignition switch has a
faillure, it can send a +12 Volts rather than a ground to the magneto.
The +12 Volts often destroyed the electronic module. This module
is expensive to replace (when available) especially on old engine.
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One
solution suggested by Kohler for their engine is to add a toggle switch
between the ground and the magneto to stop the engine. This is a full
proof solution, but a bit annoying because it need a switch to start
and an other one to stop the engine.
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Usual
circuit used with Magneto ignition system.
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An
other cheap and working solution to stop the engine and still used
only the ignition switch and protect the electronic ignition in
the case of switch faillure, is to
add a diode between the terminal "M" on the switch and
the magneto. The rest of the wiring is not modified.
The
modification need only a diode
rectifier. All you have to
do is to cut the wire between the ignition switch and the magneto
(or stator), connect the cathode end of the diode to the switch
side and the anode end of the diode to the stator side.
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Stop
circuit with the diode.
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If
you are not sure on how to identify which end is the cathode, the
diode manufacturer usually identify the cathode with a white strip
on the cathode side. On larger diode, the diode symbol can be print
on the unit. |
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If
you ever found something wrong with this modification, please let
me know.
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