Technical data

Section 08 ELECTRICAL SYSTEM
Sub-Section 03 (CHARGING SYSTEM)
08-03-1
CHARGING SYSTEM 3
GENERAL
Magneto
The purpose of the charging system is to keep the
battery at a full state of charge.
The magneto is the primary source of electrical
energy. It transforms magnetic field into electric
current (AC).
587 and 717 Engines
The magneto has a three-pole coil. Capacity is 160
watts.
787 Engine
The magneto has a 3 phase, “Y” wound stator on
18 poles. Capacity is 180 watts.
Rectifier / Regulator
587 and 717 Engines
A half-wave rectifier receives magneto AC current
and transforms it into direct current (DC) to allow
battery charging.
Included in the same unit, a regulator keeps volt-
age at a steady level (14.5 - 14.8 volts) to prevent
any damage to components.
787 Engine
A dual 1/2 wave series rectifier receives the mag-
neto AC current and transforms it into direct cur-
rent (DC) to allow battery charging.
Included in the same unit, a regulator keeps volt-
age at a steady level (14.5 - 14.8 volts) to prevent
any damage to components.
Battery
The battery is the DC source for electric starter,
multipurpose electronic module and all accesso-
ries.
Fuse
A 15 A fuse protects the charging system. If the
battery is regularly discharged, check fuse condi-
tion.
NOTE : On the XP model, there is two 15 A
fuses.
The rectifier / regulator is often the culprit of a
blown fuse. To check, simply disconnect the rec-
tifier / regulator from the circuit.
If the fuse still burns, check for a defective wire.
CAUTION : Do not use a higher rated fuse
as this cause severe damage.
TESTING PROCEDURE
NOTE : First, ensure that battery is in good
condition prior to performing the following
tests.
Current Test
Proceed as follows :
– Start engine.
– Lay an inductive ammeter on positive cable of
battery.
– Bring engine to approximately 5500 RPM.
Depending on battery charge, current reading
should be approximately 4 amperes for the 587
and 717 engines or 5 amperes for the 787 engine.
If not, check magneto output prior to concluding
that rectifier is faulty.
Voltage Test
Proceed as follows :
– Start engine.
– Connect a DC voltmeter on battery posts.
– Bring engine to approximately 5500 RPM.
If voltmeter reads over 15 volts, regulator is de-
fective. Replace it.
NOTE : Whatever the voltmeter type used
(peak voltage or RMS), the voltage must not
exceed 15 V. A faulty regulator will allow voltage
to exceed 15 V as engine speed is increased.
Rectifier / Regulator
STATIC TEST : CONTINUITY
1. Due to internal circuitry, there is no static test
available.
DYNAMIC TEST
Refer to Voltage test above.
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