Yamaha F50 Service Manual
Have a look at the manual Yamaha F50 Service Manual online for free. It’s possible to download the document as PDF or print. UserManuals.tech offer 255 Yamaha manuals and user’s guides for free. Share the user manual or guide on Facebook, Twitter or Google+.
62Y3A11 ELEC–+ 1 2 3 4 5 6 7 8 I 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 ................................................................. 8-4 Electrical components ................................................................................... 8-5 Starboard and port views........................................................................... 8-5 Front view .................................................................................................. 8-6 Top view .................................................................................................... 8-7 Tiller handle model (F50/F50A, T50/FT50B) ............................................. 8-8 Tiller handle model (FT50C) ...................................................................... 8-9 Wiring harness ............................................................................................. 8-10 Ignition system and Ignition control system ............................................. 8-11 Checking the ignition spark gap .............................................................. 8-13 Checking the spark plug caps ................................................................. 8-14 Checking the ignition coil ......................................................................... 8-14 Checking the CDI unit.............................................................................. 8-15 Checking the charge coil ......................................................................... 8-15 Checking the pulser coil .......................................................................... 8-16 Checking the pulser coil air gap .............................................................. 8-16 Checking the engine start switch ............................................................. 8-17 Checking the engine shut-off switch ........................................................ 8-17 Checking the thermoswitch ..................................................................... 8-18 Checking the oil pressure switch ............................................................. 8-18 Starting system ............................................................................................ 8-19 Checking the fuse .................................................................................... 8-20 Checking the wiring harness (10 pins) .................................................... 8-20 Checking the neutral switch..................................................................... 8-20 Checking the starter relay........................................................................ 8-20 Starter motor ................................................................................................ 8-21 Removing the starter motor pinion .......................................................... 8-23 Checking the starter motor pinion............................................................ 8-23 Checking the armature ............................................................................ 8-23 Checking the brushes .............................................................................. 8-24 Checking the starter motor operation ...................................................... 8-24 Charging system .......................................................................................... 8-25 Checking the lighting coil ......................................................................... 8-26 Checking the Rectifier Regulator ............................................................. 8-26
ELECElectrical systems –+ 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 coil. Replace the battery, and then check the whole voltage of all electrical equipments on your boat.
62Y3A118-2 1 2 3 4 5 6 7 8 I 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
ELECElectrical systems –+ 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
62Y3A118-4 1 2 3 4 5 6 7 8 I 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 digi- tal circuit tester. When measuring the peak voltage, set the selector on the digital circuit tester to the DC voltage mode . Connect the positive pin on the peak volt- age adaptor to the positive terminal of the digital circuit tester. Measuring the lower resistance When measuring a resistance of 10 Ω or less with the digital circuit tester, the correct mea- surement cannot be obtained because of the internal resistance of the tester. To obtain the correct value, subtract the inter- nal resistance from the displayed measure- ment. NOTE: Obtain the internal resistance of the digital circuit tester by connecting both of its probes and checking the display. DC V S62Y8020 Correct value = displayed measurement – internal resistance Special service tools / Checking the electrical components
ELECElectrical systems –+ 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
62Y3A118-6 1 2 3 4 5 6 7 8 I 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
ELECElectrical systems –+ 8-762Y3A11 Top view 1Stator 2Pulser coil 3CDI unit 4Ignition coil 5Starter motor 6Trailer switch
62Y3A118-8 1 2 3 4 5 6 7 8 I 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
ELECElectrical systems –+ 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