Yamaha XT660Z 2008 Service Manual page 366

ELECTRICAL COMPONENTS
1. Throttle position sensor
2. Coolant temperature sensor
3. Fuel injector
4. Fuel pump
5. Starter relay
6. Main fuse
7. ECU (Electronic Control Unit)
8. Turn signal/hazard relay
9. Headlight relay
10. Radiator fan motor relay
11. Relay unit
12. Lean angle cut-off switch
13. Battery
14. Sidestand switch
15. Stator coil
16. Crankshaft position sensor
17. O 2 sensor
18. Rectifier/regulator
19. Horn
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