SON headlights are supplied
with a heavy-duty coax lead. Plugs are either fitted at the factory or
supplied loose for custom lenghts.The assembled 50cm leads are suitable
for lights fitted to the forkcrown of a 28" wheeled bike. SON20's are
supplied with a 1.0m DIY lead.
Start fitting the headlight
in the position required. Do not fit the light upside down, as this
give very uneven illumination and cause the ingress of water in many
Fit the plugs as follows:
the plugs (in no particular
order) to the dynamo, and fasten the cable to the fork etc with
Leave enough slack to facilitate disconnection. The light is switched
and off with the switch fitted to (usually) the back of the headlight.
remove about 4cms of outer insulation
and twist the underlying wires together
slide a thin piece of heatshrink
over the wire and heat with a heatgun (or a lighter) Repeat with a
piece to cover the junction .
Bare the isolation over the
last 5mm of both wires.Crimp the 4.8mm plugs with a suitable tool or
(add a dab of solder if needed)
cover the plugs with the remaining
Rear lights are connected
to the headlight. With Lumotec lights you can use a 2.8mm plug
to the terminal with the lightning symbol. Lights are earthed through
mounting bolt, but a earthing wire can be fitted with either a 2.8mm
or to the mounting bolt with a crimp eyelet. The dynamo has no earthing
of its own. If you use the dynamo without a rear light, replace the
in the headlight with one marked 3W. Otherwise bulblife will be short
The hub is fully enclosed,
en -apart from the bearings- contains no moving parts The bearings can
not be adjusted or even relubricated without special tools, some slight
play is normal for this design. The seals cannot cope with a high
hose or submersion, so care should be exercized when cleaning the bike.
Check the wiring occasonally
for frays, as the open voltage can be unpleasant.
The hub cannot be serviced
without special tools, contact us if you have problems. Read the FAQ
The open voltage and the
power surge during switching can reach high values and give a nasty
For this reason you should always use quality wiring and insulation.