Separate connectors of turn signal lamp switch and use
a piece of wire to short circuit respectively power input
line of the switch and power lines output to left and right
turn signal lamps.
Scintillator is damaged.
Inner contact of turn signal lamp is
poor contacted.
Check if there is power output from power input line of
turn signal lamp switch by lamp test
Test lamp is on Test lamp is off
Power line of turn signal lamp
is broken or shorted.
Wire from ignition switch to
scintillator or from scintillator to
turn signal lamp switch is shorted
or broken.
Turn signal lamp is on after short
Turn signal lamp is still off after short circuit.