Classic Dynamo and Regulator Conversions Ltd

Classic Dynamo and Regulator Conversions Ltd Dynamo rebuilding - Electronic dynamo regulators - LED products for vintage and classic cars

Specialists in dynamo rebuilding - Electronic dynamo regulators
LED products for vintage and classic cars & motorcycles
Good old fashioned standards, but as modern as the hour and as sure as the sunrise............

Something I see often with pre war Rotax dynamos is a cracked (and often repaired) brush ring. Most that come into the w...
12/06/2026

Something I see often with pre war Rotax dynamos is a cracked (and often repaired) brush ring.
Most that come into the workshop are like this.

The ring holds the brush boxes which are adjustable for optimum output. If they break, the brushes move around and the ring comes off, on to the commutator and can cause damage.

The answer?

CNC a replacement from billet aluminium and improve it at the same time. I had a batch made some 10 years ago.
They are made thicker in the area that they always crack.

I always replace them if they are broken, repaired or corroded.

Another great improvement from Classic Dynamo 😀

Our LB9 light board is one of our best selling LED light boards as it gives an amber indicator through a red lens on man...
13/05/2026

Our LB9 light board is one of our best selling LED light boards as it gives an amber indicator through a red lens on many wing mounted rear lamps such as the Lucas 549.

People ask me if it can be used on cars currently fitted with a Lucas DB10 relay which flashes the brake light as an indicator.
Not ideal on modern roads as many only recognise an amber flashing light as a turn signal.

The answer is YES 😀 With just a few easy alterations you can have amber flashing indicators through a red lens.

I've put together some simple instructions and a diagram to show you how to do it.

https://www.dynamoregulatorconversions.com/the-cdrc-online-shop.php #!/LB9-Stop-tail-and-Amber-Indicator/p/613320594

My apologies for the lack of “On the bench today” posts of late. Our sheer workload has kept me in the workshop with ver...
09/05/2026

My apologies for the lack of “On the bench today” posts of late. Our sheer workload has kept me in the workshop with very little time to post about the things we do 🙂

I always take pics of the dynamos we rebuild and repair and the regulators and cut outs I convert.

Here’s a pre war Lucas cut out that came in burnt out. Totally overhauled and converted to a solid state cutout. All connections remain the same. Not a big fat diode, but a cleverly thought out and protected system that works perfectly 👌🇬🇧

You know and trust our 12v ULTIMATE H4 LED headlamp bulbs. People often ask if they’re available in 6v. Well now they ar...
08/05/2026

You know and trust our 12v ULTIMATE H4 LED headlamp bulbs. People often ask if they’re available in 6v.

Well now they are 😀👌

Introducing the 6v ULTIMATE H4 LED headlamp bulb.
As with the 12v version, it’s perfectly designed and made to give focused beams, right where you need them 😀

Perfect for any 6v car or motorcycle 🙂

In our online shop now.

https://www.dynamoregulatorconversions.com/the-cdrc-online-shop.php #!/6v-P43t-H4-LED-Dipping-Headlamp-Bulbs-Classic-White-3000k/p/834500272

If you need ST51 D lamps or ST38 Pork Pie lamps for your classic,, we have them made. We don't buy them in from someone ...
30/03/2026

If you need ST51 D lamps or ST38 Pork Pie lamps for your classic,, we have them made. We don't buy them in from someone else who has already put a mark up on them. We also stock a range of spare parts for them and all at down to earth prices 😃

Great quality units in black enamel or chrome........ https://www.dynamoregulatorconversions.com/the-cdrc-online-shop.php #!/ST51-D-Lamp-Early-Type-Split-Lens/p/101835329

Our LED conversion light boards that give a light that's brighter than a bulb but shines like a bulb, unlike others that have the LED chips right behind the lens so you can see every individual chip.

We also stock Lucas L549 rear lamps which take our direct replacement LED stop/tail bulbs, OR you can easily fit our rather special LB9 light board that gives you stop/tail AND an amber flashing indicator through a red lens.

Perfect for adding hidden indicators 😃

Day 3 here at the NEC, and there’s a buzz in the air. My thanks again to the ladies at Boston Classic Car Club for provi...
22/03/2026

Day 3 here at the NEC, and there’s a buzz in the air. My thanks again to the ladies at Boston Classic Car Club for providing the lovely home made cakes 😀🍰🧁🍥

Come and treat your classic to a nice new electronic dynamo regulator. Our ADR (Advanced dynamo Regulator) range include...
20/03/2026

Come and treat your classic to a nice new electronic dynamo regulator.

Our ADR (Advanced dynamo Regulator) range includes two of the most common regulators of the post war era up until around 1970.

Our ADR106 directly replaces the Lucas RB106 with either the early type screw terminals or the later spade terminal version.

Our ADR95 replaces the Lucas RF95.

Fully fuse protected and current limited for trouble free charging. Nothing to adjust or wear out.

Forget the cheap and nasty, over priced Indian made mechanical copies available from some sellers or on eBay.

Our regulators are proudly Made in England by us and each one is carefully assembled by hand and load tested to ensure perfection 👌🇬🇧

Nickel plated terminals and screws, a smooth galvanised clip to protect against corrosion.
Our PCB’s use only the very best quality components and the heat sink is machined from aircraft quality aluminium.

Satisfied customers across the world.

Come and see what quality looks like 😀

All set up and ready to go at the NEC for the Restoration Show. Hall 4, plot AJ130. See you over the weekend 😀
20/03/2026

All set up and ready to go at the NEC for the Restoration Show.

Hall 4, plot AJ130. See you over the weekend 😀

On the bench today................... another one I see plenty of.If your micro car or motorcycle uses a Siba dynastarte...
29/01/2026

On the bench today................... another one I see plenty of.

If your micro car or motorcycle uses a Siba dynastarter, you will eventually have problems with its regulator. Age and use takes its toll and the regulator section of the controller eventually fails and on comes the charge warning light.

Here at Dynamo Towers we've developed the answer to this problem. Out with the old, in with the new and everything looks as it did before. All connections remain the same. Unlike the original regulator/cut out, ours is current limited to a safe, nominal 9 amps (108 watts) so the dynamo section of the dynastarter is protected from overload.

The pictures tell the story................
1. What it looks like when I receive it.
2 & 3. Lid off before conversion.
4. After conversion.
5. Conversion done, lid back on.
As you can see, externally, nothing changes.

All you need to do is take your failed controller off and send it to me. I work my magic, load test it and send it back to you for re-fitting. Job done! Tell your friends 😀

One of todays conversions is one I do often. Converting a Lucas CFR2 cut out to an electronic regulator to work with an ...
19/01/2026

One of todays conversions is one I do often. Converting a Lucas CFR2 cut out to an electronic regulator to work with an Austin Seven Lucas C35 dynamo converted to 2 brush, either 6v or 12v giving reliable and efficient charging 😃 I can convert pretty much any cut out.

Modern batteries don't like 3 brush dynamos, giving a high and constant charge, it tends to warp the plates. Our electronic conversion ensures that a load is compensated for and the battery is always well charged, but never over-charged.

As it came in, it exhibits a common "get you home" bodge although I rather think this one is more than just a "get home" and more a permanent! Oversize fuse wire wrapped around the fuses.

You can also see that the conversion to an electronic regulator, eliminates the need for the field fuse (the one on the right).
The auxilliary fuse (left) remains and there's a new fuse across the front which protects the regulator and the dynamo.

Address

Saxilby
Lincoln
LN12

Opening Hours

Monday 8am - 4pm
Tuesday 8am - 4pm
Wednesday 8am - 4pm
Thursday 8am - 4pm
Friday 8am - 12pm

Telephone

+441522703422

Website

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