KEEWAY RKV125 - Dim Headlamp Diagnosis

Symptom: Headlamp is dim. Diagnosis procedures
Headlamp is dim
Separate conductors of lead wire bundle of magnet from
cables of the whole vehicle. Measure and check with an
ohmmeter if resistance between lead wire section output
from magneto lighting coil is smaller than the standard.
Turn on ignition switch; press horn button
or slide turn signal lamp switch.
Lighting coil is
shorted.
Start engine and limit its RPM. Separate
conductors of rectification regulator from the
cables of the whole vehicle. Check brightness of
light.
Headlamp light recovers
after separation.
Headlamp light is still
dim after separation.
Stable voltage of
rectification regulator is
too low.
Check if charging coil of
magneto and wirings in the
charging system are shorted.
Electric horn sounds
loudly. Turn signal lamp
is bright.
Electric horn sounds hoarse.
Turn signal lamp is dim.
Battery is low or the connection
position between ignition switch
and battery is badly contacted.
Check and solve
problem.
Disassemble headlamp assembly and check if
the bulb glass black or yellowish-green.
Yes
Yes
No
No
AC power supplied lighting system
DC power supplied lighting system