Yamaha F4B, Service Manual

Page: 63 / 202

5-4
Charging unit and component
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A
Charging unit and component
Checking the lighting coil (optional
for European market)
1. Remove the holder
a
, and then discon-
nect the lighting coil connectors
a
.
2. Measure the lighting coil output peak
voltage.
TIP:
To prevent the engine from starting when
cranking it, remove the clip from the engine
shut-off switch.
3. Measure the lighting coil resistance.
4. Connect the lighting coil connectors, and
then fasten the lighting coil leads using
the holder
a
.
Checking the Rectifier Regulator
(optional for European market)
If the battery cables are connected in
reverse, the Rectifier Regulator can be
damaged.
1. Remove the holder
a
.
2. Measure the Rectifier Regulator output
peak voltage.
TIP:
Do not use peak voltage adapter B when
measuring the Rectifier Regulator output
peak voltage.
3. Disconnect the Rectifier Regulator
connectors
a
,
b
,
c
, and Rectifier
Regulator ground lead
d
.
4. Check the Rectifier Regulator for
continuity. Replace if out of specification.
Lighting coil output peak voltage:
Green (G)–Green (G)
r/min
Unloaded
Cranking 1500 3500
DC V 20.0 30.1 64.3
Lighting coil resistance (reference data):
0.771–0.869

at 20 °C (68 °F)
G G
a
a
Rectifier Regulator peak voltage:
Red (R)–Ground
r/min
Loaded
1500 3500
DC V 13.0 13.0
R
R
a
R
a
b
c
d
d
c
b
a
Checking the electrical component / Charging unit and component