Section 10
ELECTRICAL SYSTEM
Subsection 03
(CHARGING SYSTEM)
SMR2002-039_10_03A.FM
10-03-1
CHARGING SYSTEM
0
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).
717 Engine
The magneto has a three-pole coil. Capacity is 160
watts.
947 Engine
The magneto has a 3 phase, “Y” wound stator on
18 poles. Capacity is 180 watts.
787 RFI and 947 DI Engines
The magneto has a 3 phase, delta wound stator
on 18 poles. Capacity is 270 watts.
Rectifier/Regulator
All Models
The rectifier receives AC current from the magne-
to and transforms it into direct current (DC).
The regulator, included in the same unit, limits
voltage at a maximum level (14.5 to 14.8 volts) to
prevent any damage to components.
717 Engine
A half-wave rectifier receives magneto AC current
and transforms it into direct current (DC) to allow
battery charging.
947 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.
787 RFI and 947 DI Engines
The unit is using a 3 phase in series rectifier/regulator
which transforms (AC) from the magneto into (DC) to
allow battery charging.
Battery
The battery is the DC source for the electric start-
er, the Multi-Purpose Electronic Module and all ac-
cessories.
Fuse
If the battery is regularly discharged, check fuse
condition.
The rectifier/regulator could be the culprit of a blown
fuse. To check, simply disconnect the rectifier/
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.
GTX RFI Models
The charging system is protected by 2 fuses.
A 15 A fuse is mounted on the MPEM and a 20 A
fuse is located in the rear electrical box.
DI Models
The charging system is protected by 2 fuses.
A 25 A fuse is mounted on the MPEM and a 30 A
fuse is located in the rear electrical box.
All Other Models
Two 15 A fuses protect the charging system. The
first one is mounted on the MPEM and the other
one is located in the rear electrical box.
TESTING PROCEDURE
NOTE:
First, ensure that battery is in good condi-
tion prior to performing the following tests.
Rectifier/Regulator
NOTE:
All models with a
947 engine
, the rectifier/
regulator is integrated in the MPEM.
STATIC TEST: CONTINUITY
Due to internal circuitry, there is no static test avail-
able.
DYNAMIC TEST
Current Test
Carburetor-Equipped Engines and 947 DI
Engines
Proceed as follows:
– Start engine.
– Lay an inductive ammeter on positive cable of
battery.
– Bring engine to approximately 6000 RPM.
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Summary of Contents for GTI 5558
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