Dynamo-6 to 12 volt conversion

Yup -except that its the weirdest (single bolt only) fitment I've ever seen.

And its huge - in every sense, meaning I'll need to change all the other pulleys to get a modern belt to fit on. And an alternator will look daft on an early flathead engine.

I can find converters- too add a small stereo or something -but nowt bigger.

Cheers though

Ta Seth -you OK?
Sadly its the original rear lights that were the biggest problem. They're thick, red glass- and the 6volt bulbs were hopeless. I tried everything - inc high wattage bulbs -but you couldnt even see them on a cloudy day -let alone a bright summers day (when its most likely to be used!) Add the indicators -roof mounted(!) and they need to be visible to be noticed.

Add a huge starter motor (solenoid is mechanically foot operated!) that slowly ground over, & glacial wipers -made my decision for me.

On 12 volts the bulbs are clearly visible, the wipers move sensibly and the starter spins up. I've converted everything (bulbs, flashers etc) --just this dynamo issue left.

Cool truck!

Will not swapping the regulator for a 12V one not work? (I assume it has a regulator, and not a ballast or a third brush for when the lights are off.) There are electronic ones about: This one is 60W, but a mechanical one might work.

If there is no regulator, then I think your only options are a rewind or a DC-DC converter. I reckon a rewind would be the safer bet.

So does it actually have a regulator?

If not, here's some info on three brush dynamos: THREE-BRUSH DYNAMO Here, the light switch also directly controls the current in the field winding. Does the layout look anything like that? If it does, you might be able to get more volts out of it by adjusting the field brush.

Hi Nigel, praps some of the classic bike magneto types might be more use. This guy has a good reputation (not used him though).
Truck is damn nice btw

www.davelindsley.co.uk/armature-rewinding-service.html