Yamaha YJ125S Service Manual page 293

FAULTY LIGHTING OR SIGNALING SYSTEM
TURN SIGNAL REMAINS LIT
8Faulty turn signal relay
8Burnt-out turn signal bulb
TURN SIGNAL BLINKS QUICKLY
8Incorrect turn signal bulb
8Faulty turn signal relay
8Burnt-out turn signal bulb
HORN DOES NOT SOUND
8Improperly adjusted horn
8Damaged or faulty horn
8Faulty main switch
8Faulty horn switch
8Faulty battery
8Blown, damaged or incorrect fuse
8Faulty wire harness
8-6
TRBL
SHTG