Specifications

94
Chapter 6 Electrical system
3 Charging system: checking the output
1 A defect in the charging system will produce poor
headlamp performance, and probably, repeatedly discharged
batteries. In order to check that the battery is receiving the
correct charge, the following procedure should be adopted:
2 Obtain a 0 - 10 volt dc voltmeter, and connect this
between the two battery terminals. Disconnect the battery posi-
tive lead (red and white) from the battery, and connect an
ammeter capable of measuring 0-4 amps at least, and
connect this between the positive battery terminal and the lead.
3 Start the engine, and check the charging characteristics
with the following figures:
Switch
Ignition
On
On
position
Lighting
Off
On
Initial charge
6-3v a
rpm
max
6-3v«
rpm
max
1000
1500
a 4000
rpm
8-5v,20
amp
minimum
8-0v, 0-8
amp
minimum
• 8000
rpm
8-8v, 3-7
amp
maximum
8-5v, 20
amp
maximum
4 While it is essential that the battery is in good condition and
fully charged for the results of this test to be accurate, if the
readings obtained differ widely from those given the battery
should be checked first to ensure that it is not at fault. Check the
generator coils as shown in Fig. 6.2, and check also that the
rectifier is in good condition, as described in Section 4. Always
have your findings checked by an expert using the correct test
equipment before attempting repairs or renewing components.
4 Rectifier: checking for malfunction
1 The rectifier, as mentioned previously, changes the alter-
nator output from ac to dc. It takes the form of a small sealed
unit, mounted in a rubber sleeve at the front of the battery case.
It is easily dismounted for examination, if suspected of
malfunctioning.
2 Test the unit using a pocket multimeter set on the
resistance scale. Place one lead from the meter on each ter-
minal, and note the reading given. Now transpose the leads, and
note the second reading. If all is well, no resistance will be
found in one position, and infinite resistance in the other. If this
is not so, the chances are that the unit is in need of renewal. A
Honda Service Agent will be able to verify this, and supply a
new component.
3.2a Stator can be removed for testing if required
3.2b Check condition of oil seal and O-ring prior to reassembly
Yellow
IGNITION COIL/CONDENSER
1 Black
White/Yellow
F.L.=tall light
M.L=meter light
H.L.=headlight
SPARK PLUG
day time
H. L
SILICON RECTIFIER
AC GENERATOR FLYWHEEL
T.L
6V.6AH
M.L
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Fig. 6.1 Charging system schematic diagram - early CG125 models