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 6VACRMB.

Buy The CT110 Regulator Here

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

Pardue Brothers currently ships USPS Flat Rate Priority Mail to the USA, Canada, Australia, United Kingdom, Malta, Republic of Ireland and New Zealand.
All International Orders must include a phone number for the Customs form 2976

** Shipping for up to 6 regulators is automatically combined to save you $$ **

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If you live anywhere else in the world and want our products, please Contact Us first to arrange shipping

Pardue Brothers can make parts for other 6Volt motorcycles that are not listed here. We do not sell generic parts. Every part we make is custom made with the correct wire colors, length and instructions for your bike.

If you don’t see your motorcycle listed here and you need one of our parts please contact us

Contact Us

We will work with you to create a solution for your bike if you can provide us the details we need.

That’s a really good question, so I just wrote a blog post about it and you can find that here
https://parduebrothers.com/wondering-if-you-need-a-new-rectifier/
This is a question that requires some details about your bike. Please contact Jon Pardue at the contact page Here so he can help you with it.
Documents will be delivered directly to your email.  They are not instant downloads.  Jon checks every document, personalizes them with your name, and updates with any new information before he sends them.  Document orders are shipped within 24 hours and usually sooner.