Yamaha F50 Service Manual

62Y3A11
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Electrical systems
Troubleshooting ............................................................................................. 8-1
Special service tools ..................................................................................... 8-2
Checking the electrical components............................................................ 8-4
Measuring the peak voltage ...................................................................... 8-4
Measuring the lower resistance...

ELECElectrical systems
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8-162Y3A11
Troubleshooting8
Before troubleshooting the charging system, check that all electrical connections are tight and free
from corrosion, and that the battery is fully charged to 12 V.
Symptom: Battery becomes weaker quickly.
Check the charging system.
Measure the Rectifier Regulator 
output peak voltage.
Replace the lighting coil.Out of specifi-
cation?
Out of specifi-
cation?Replace the Rectifier Regulator.
No
No
Yes
Yes
Measure the output peak voltage of the lighting...

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Special service tools8
Dynamic spark tester
YM-34487
Digital multimeter
YU-34899-A
Peak voltage adaptor
YU-39991
Test harness (2 pins)
YB-06767
Pressure/vacuum tester
YB-35956-ADial gauge
YU-03097
Magnetic flexible stand
YU-34481
Test harness (3 pins)
YB-06770
Test harness (4 pins)
YB-06771
Ignition tester
90890-06754
For USA and Canada
For worldwide
Troubleshooting / Special service tools 

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8-362Y3A11
Digital circuit tester
90890-03174
Peak voltage adaptor
90890-03172
Test harness (2 pins)
90890-06767
Vacuum/pressure pump gauge set
90890-06756
Dial gauge set
90890-01252Magnet base
90890-06705
Test harness (3 pins)
90890-06770
Test harness (4 pins)
90890-06771 

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Checking the electrical 
components
8
Measuring the peak voltage
The condition of the ignition system can be
determined by measuring the peak voltage.
Cranking speed is effected by many factors,
such as fouled or weak spark plugs, or a
weak battery. If one of these factors is
present, the peak voltage will be lower than
specification. In addition, if the peak voltage
is lower than specification the engine will not
operate properly.
NOTE:
Use the peak voltage adaptor with the...

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8-562Y3A11
Electrical components8
Starboard and port views
1Stator
2Pulser coil
3CDI unit
4Ignition coil
5Oil pressure switch
6Thermoswitch
7Prime Start
8Rectifier Regulator9Starter relay
0Starter motor
APTT switch coupler
ÈPower trim and tilt model with tiller handle 

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Front view
1Stator
2Pulser coil
3CDI unit
4Fuse
5Neutral switch (tiller handle model)
6Starter relay
7Starter motor
8Power trim and tilt relay (power trim and tilt 
model)ÈTiller handle model
Electrical components 

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8-762Y3A11
Top view
1Stator
2Pulser coil
3CDI unit
4Ignition coil
5Starter motor
6Trailer switch 

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Tiller handle model (F50/F50A, T50/FT50B)
1Engine start switch
2Engine start switch harness
3Engine shut-off switch
4Engine shut-off switch connector
5Neutral switch
6Battery lead
7Wiring harness extension
8PTT switch lead
9Power trim and tilt switchÈApplicable for tachometer, trim meter or 
warning buzzer model
Electrical components 

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8-962Y3A11
Tiller handle model (FT50C)
1Engine start switch
2Engine start switch harness
3Engine shut-off switch
4Engine shut-off switch connector
5Neutral switch
6Battery lead