The story on how this product came to be:
The CT110 has a unique electrical system, for sure.
Mel on the CT90 Yahoo group introduced me to it some years ago, and after several tries I designed a special Voltage regulator
that does not hinder low speed headlight Voltage – which can be marginal at times – but it does
save the filament automatically as engine speed increases, burning off the excess Voltage as heat.
In early 2012 we started manufacturing and shipping the special Voltage regulator just for the 6 Volt CT110 headlight overVolt problem,
giving it part number 6VACRMB.

On all CT110 models, the headlight and high beam indicator lamp are powered by AC, directly from a stator winding.
On all CT110 models, the ignition is powered by a separate winding in the stator.

The first two year models have points and condenser ignition powered by AC.
Somewhere in the ’83 production run Honda installed CDI ignition, also powered by AC from a separate stator winding.
The dash and neutral lamps, blinkers and indicator, stop/tail lamp, and horn are all powered by switched, fused power from the battery.
A single winding from the stator charges the battery through a half-wave rectifier.

Just for contrast, everything on a CT90 is powered by the battery,
and the charging system involves a more complex rectifier and stator coil switching arrangement.

The CT110 is simpler…. however…

Quite often at some point in the life of the bike, the AC headlight Voltage goes way up.
This problem seems to be located in the stator itself, manifesting as too-high headlight Voltage just above idle.
The bike will blow headlight bulb filaments quickly.
Changing the stator is not only costly, but the overVolt problem typically re-occurs.
I designed and developed a special Voltage regulator for the CT110 headlight overVolt problem.
Mel figured out it would fit in the headlight bucket, and the Pardue Brothers manufacture and stock it under part number 6VACRM.

The device is solidly built in a weatherproof housing, with Honda plug-in connectors and color-coded wiring for a simple and quick fix.

Buy it Here!