Yamaha YFM4FAR Service Manual page 373

4.Diode
Remove the diode from the coupler.
G
Connect the pocket tester (Ω × 1) to the
G
diode terminals as shown.
Check the diode for continuity as follows.
G
Tester (+) lead →
Blue/Black terminal 1
Tester (–) lead →
White/Blue terminal 2
Tester (+) lead →
White/Blue terminal 2
Tester (–) lead →
Blue/Black terminal 1
5.Start switch
Refer to "CHECKING THE SWITCHES".
This circuit is not faulty.
*
C0NTINUITY
Continuity
No
continuity
CORRECT
CORRECT
SIGNAL SYSTEM
NOTE:
When you switch the tester's positive and
negative probes, the readings in the left chart
will be reversed.
INCORRECT
Replace the diode.
INCORRECT
Replace the handlebar switch (left).
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– +
ELEC