Yamaha YQ50 Service Manual page 173

4. Connections
• Check all connections in the signal system.
Refer to "WIRING DIAGRAM".
Check the condition of each circuit of the
signal system.
Refer to the section "SIGNAL SYSTEM
CHECK".
SIGNAL SYSTEM CHECK
1. Horn does not sound
1. "HORN" switch
• Disconnect the handlebar switch (left) from
the wire harness.
• Check for continuity between:
Black Q and Pink W.
OFF OFF
ON ON
GB B Y
Ch
P BrW L
2. Voltage
• Connect the pocket tester (DC20V) to the
horn lead.
Pocket tester (+) lead © Brown Q
Pocket tester (-) lead © Ground W
• Turn the main switch to ON.
• Check for voltage (12V) between "Brown"
and the ground.
GOOD
CONNECTIONS
B P
-
Dg
CONTINUITY
SIGNAL SYSTEM
POOR CONNECTIONS
Repair.
NO CONTINUITY
Horn switch is defect © Replace.
8-23
ELEC