|Please first check whether the regulator delivers
voltage. For this, disconnect the red and the brown cable from the regulator.
Than connect to the regulator brown (6v regulator: white) and red some headlight bulb and start the
- If the bulb shines you have to look for the problem in the bikes
# the wire that goes to the main switch or the main switch itself
# you might have a ground connection problem
- If the bulb stays dark, you seem to have a problem either with the
regulator or the stator coil.
# Disconnect the two black wires that run from the stator to the regulator
# ... and measure the AC voltage at these black cables with engine
running. Do not rev the engine too high, this may blow your bulb
In a 12 volt system should be about revolutions/100 in volts. That is
1000 revs give abvout 10V, 5000 revs 50 volts. If this is so, the stator is ok
and probably the regulator is defective.
Take a sniff at the regulator,
if it smells burned - it is damaged (mostly caused by a wrong wiring)!
If there is no voltage at the black generator cables, you have
probably a faulty stator.
# first carefully inspect the stator for any damage of the copper
# take the stator off and check whether one of the wires are pinched (see
more info here)
# check resistance
of the stator coils (in the case of lighting broblems between the
ADVICE: it may be that a cheap meter will not show the "0.xxx Ohm".
- It happens that actually everything with the production of lighting
voltage is OK, but still lights are very dim. The culprit here often
is a faulty battery which burns the offered voltage. To check, just
disconnect the battery for a test and check how lighting is (with
running engine). If lights are ok than, your battery needs to be
replaced. More info see here.