1991-1993 Yamaha Exciter II-570 Service Manual, Page 191Get this manual
SIGNAL SYSTEM
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BRAKE LIGHT SWITCH 1Disconnect: Brake light switch coupler 2Connect: Pocket tester (90890-03112, YS-03112) (to brake light switch coupler)
3Check: Brake light switch continuity FaultytReplaceSwitch position Brake lever is opetate Brake lever is not operate Good condition
0: Continuity
x: No continuity
THERMO SYSTEM 1Disconnect the thermo switch lead (Green Red) and remove the thermo switch CD