Yamaha F4B, Service Manual

Page: 64 / 202

5-5
ELEC
Electrical system
OL: Indicates an overload
TIP:
Make sure to set the tester measurement
range to the diode mode.
5. Connect the Rectifier Regulator
connectors
a
,
b
,
c
, and Rectifier
Regulator ground lead
d
.
6. Fasten the Rectifier Regulator leads
using the holder
a
.
Ignition unit and component
Checking the ignition spark
1. Disconnect the spark plug cap from the
spark plug.
2. Connect the spark plug cap to the special
service tool
a
.
3. Crank the engine and check for a spark.
WARNING! Do not touch any of the
connections of the special service
tool.
4. Disconnect the special service tool
a
,
and then connect the spark plug cap.
Checking the spark plug cap
1. Remove the spark plug cap from the
spark plug wire by turning the cap coun-
terclockwise.
2. Measure the spark plug cap resistance.
Rectifier Regulator continuity
(testing diode mode):
Tester probe
Display value
(reference data)  
a
b
OL
c
OL
d
OL
b
a
0.384 V
c
0.938 V
d
0.649 V
c
a
0.384 V
b
0.938 V
d
0.654 V
d
a
0.716 V
b
0.384 V
c
0.384 V
a
b
c
d
Ignition tester (spark gap tester)
a
:
90890-06754
Spark plug cap resistance
(reference data):
5.0 k

at 20 °C (68 °F)
OK
a