Generator Inspection - Segway SNARLER ATV 2021 Series Service Manual

ELECTRICAL SYSTEM

Generator inspection

There are three types of alternator faults: short circuit, disconnection, or rotor magnetic loss. Short-
circuiting one of the coils or disconnecting the wire will result in low output or no output at all. A loss
of the magnetic fi eld of the rotor may be caused by a drop
or by placing the AC generator near the electromagnetic
field, thereby hitting the magnetic field of the AC generator
or simply due to aging, resulting in low output. To check
the output voltage of the alternator, perform the following
procedures.
◆ Remove rear fender (see Chapter "Frames")
◆ Disconnect the alternator connector 【A】 (1, 2, 3 in the
connector are magneto three-phase outgoing lines)
◆ Connect the handheld tester as shown in the following
table
◆ Start the engine. Run it at the speed shown in the table. Note the voltage reading (three
measurements in total).Ac generator output voltage
Range tester
250 V AC
If the output voltage is within the value in the table, the alternator is operating normally and the
regulator/rectifi er has been damaged. A much lower reading indicates that the AC generator is defective.
Check the stator coil resistance as follows:
◆ Stop the engine
◆ Disconnect the AC generator connector
Connect the handheld tester as shown in the table below.
Pay attention to the readings (3 measurements in total).
Stator coil resistance
Range tester
×1 Ω
◆ One yellow lead and the other yellow lead if the resistance is greater than that shown in the table,
or show nothing. Read the (infi nity) of any two wires, the stator has an open circuit and must be
replaced. Less resistance means that the stator is short-circuited and must be replaced.
◆ Using a handheld tester, measure the resistance between each yellow lead with the engine. Any
reading less than infi nity must be replaced.
◆ If the stator coil has normal resistance, but the voltage check shows that the AC generator is faulty;
then the rotor magnetism may have weakened and the rotor must be replaced.
Tester connection
（+）
One Yellow wire
Tester connection
（+）
One Yellow wire
14 - 12
（–）
Another Yellow wire
（–）
Another Yellow wire
A
1
2
3
Reading
@3000 rpm
36~54 V
Reading @3000 rpm
0.30 _ 0.49Ω