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I've a 6volt dynamo on a French 50's breakdown truck I'm slowly sorting. Vehicle is now 12 volt=the lights were just too dim.
Is there any way of converting this dynamo- short of a total rewire -from 6 to 12? I've heard whisper of some type of converter....
I'll NOT be replacing it with an alternator -and its a bizarre, huge, single attach bracket I've not seen before -so replacements an unlikely option.
Anyone know of such a converter, please?
Thanks
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MrSpeedy
East Midlands
www.vintagediesels.co.uk
Posts: 4,791 
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Jun 13, 2011 16:05:28 GMT
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There are voltage convertors available, but I don't think I've seen one from 6v - 12v. Why won't you fit an alternator ? It seems a little odd to go through the process of improving your elctrically syatem and then still having an inefficient charging device that will still be the weakest part of it all ? First thing I always do with a motor with a dynamo is replace it with an alternator. Sometimes originality isn't always best  |
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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
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Seth
South East
MorrisOxford TriumphMirald HillmanMinx BorgwardIsabellaCombi
Posts: 15,543
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Follow your dreams or you might as well be a vegetable. |
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Jun 14, 2011 12:27:24 GMT
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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.
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Jun 14, 2011 12:29:48 GMT
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Thought it might help to add a couple of pics :-   |
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Last Edit: Jun 17, 2011 12:49:54 GMT by HARDCORE
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Jun 14, 2011 17:33:38 GMT
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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. |
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Jun 14, 2011 17:58:48 GMT
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Yes -but I cant find anyone capable of rewinding it! 3 times I've been given a price- then ''declined'' on arrival.
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Jun 14, 2011 20:26:50 GMT
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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. |
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Jun 15, 2011 13:36:03 GMT
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Built in regulator- s'not a 3 bush (had one on a 30's car).
Just have to keep trying to find someone competent to rewind it I guess. Cheers though
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Jun 15, 2011 15:50:41 GMT
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'66 Amazon <-> '94 LS400 <-> '86 Suzuki 1135 EFE
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Jun 15, 2011 21:11:24 GMT
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You could have a go at re-winding yourself?
If the dynamo is huge, that should make things a little more easy to actually do, like wind and solder the wire.
You would just need to work out how many turns of what gauge wire, and then wind away.
I have done it to small rc car motors in the past with some succsess. I only really had issues due to the small scale of the stuff I was working with.
Does a dynamo used fixed magnets (i.e. not electro magnets) to create the field? if it uses fixed magnets, you could replace them with neodinium magnets to get some more power from it as well as the higher voltage?!?!
Just some random thoughts.
Lewis
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stealthstylz
Club Retro Rides Member
Posts: 14,960
Club RR Member Number: 174
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Dynamo-6 to 12 volt conversionstealthstylz
@stealthstylz
Club Retro Rides Member 174
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How big is the dynamo? Would it be possible to empty all the gubbins out of it and fit an alternator inside the casing? I've seen it done on trad hot rods and it works well.
Matt
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