Symptom: Light bulb is burnt frequently Diagnosis procedures
Light bulb is burnt frequently
Turn on ignition switch; press horn button
or slide turn signal lamp switch.
Electric horn does not sound or sound
hoarse. Turn signal lamp is dim.
Electric horn sounds loudly.
Turn signal lamp is bright.
1. Check if the connector to the battery is poorly
contacted;
2. Check if electrolyte in the battery is not enough.
3. Check if density of electrolyte in the battery is
too low; check if pole plates inside the battery are
vulcanized or broken.
Separate conductors of rectification regulator from
cables of the whole vehicle. Measure and check with
an Ohmmeter if wirings between lighting and
charging coil of magneto and regulator are broken.
Set multimeter on 0V~20V DC voltage, measure
voltage between the wire from connector to battery
terminal (usually a red or red/white line) and the
ground.
Connect well the
broken wire.
No voltage display Voltage displays
Wiring from connector to
battery is broken.
Check if regulator malfunctions.
Yes No
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