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12 volt conversion to D1
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clodhopper
Saltburn by the Sea, Cleveland
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August 14, 2016 - 11:13 am
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I am toying with changing my D1 from 6 to 12 volts. I have had a Rex Caunt conversion on my D7 for some time and it works like a dream.

On looking for options on this further change to the D1, I found a reference to a do it yourself job, done by connecting some existing wires in the coil/stator area, add a few other bits, change the battery and bulbs, and off you go!

Has anyone actually seen or done this or even heard of it? If so did it work long term?

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MOSOGER
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August 14, 2016 - 12:05 pm
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Hi Clodhopper..

I did the same conversion to my lads D1.. and all is fine.

I have the diagram's etc but I believe the copy rights belong to Lone Wolf. (CUE LONE WOLF)

He will surely see your thread and respond, rather than me take any credit. thumbs-uptip-my-hat

And as a bonus it will be in colour.smileor look up Lone Wolf's posts where you will find it.

Regards Bob.

Mosoger

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Anderzander
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August 14, 2016 - 1:27 pm
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I think I first read about the D1 12v conversion here: ** Please log in to view **

i fitted the Rex Caunt ignition - but in my D1. At some point I'd like to fit one to my D7, so I'm almost in the reverse scenario to you.

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Paxo
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August 15, 2016 - 11:54 am
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I would only consider the wiring upgrade to 12v if you have a battery model D1 and not a direct model.

Otherwise, just fit brighter bulbs.

Regards

 

Paxo.

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grahamkeen1
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August 13, 2019 - 2:04 pm
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Has anyone got a co[y of the information pointed to by the link 2 replies back ?

Unfortunately the link points to TalkTalk webspace which has now been shut down.

Thanks,

Graham.

D1 Renovation; had it for 50 years and thought I ought to start :)

However, as I thought it might take a while, bought a B40 to ride.

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cocorico
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August 13, 2019 - 2:45 pm
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Like many things, Lone Wolf's method of 12V conversion is in FAQs, but I don't think it covers the D1. If you are happy to delve in to the electrics, you would be looking at (possibly) reconnecting the 'power' coils, converting to battery (if it's a non-battery version)  and other changes. There is plenty of other discussion on the merits of 12v on the forum, not necessarily model specific. Otherwise, the recommendation from Paxo (RIP) might be the best route.

1956 D3 awaiting a new magneto. 7 other bikes in the Barn, 6 runners and a still in progress Morini 250

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mike p5xbx
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August 13, 2019 - 5:54 pm
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regarding the link above which no longer works
I saved part of that page its basically just using the existing two lighting coils which will just about give a 12v output
and connected to a bridge rectifier and with a Zener diode as a regulator
you really need to add a 3rd lighting coil to get a usable 12volt output

GWd112volt.jpg

sp_PlupAttachments Attachments

D? - D10- D14 Bantams 350 AJS -500 Triumph http://bsanotru.....lfire.com/

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grahamkeen1
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August 13, 2019 - 6:06 pm
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Cocorico, Mike, Thank you both for the information.

My D1 is a Lucas variant so has the battery ready. I'm OK with Bike and 'old car' electrics and had thought of several ways to have a go, but it's always better to go for a tried and tested route where possible.

I will continue researching options.

Many thanks,

Graham.

D1 Renovation; had it for 50 years and thought I ought to start :)

However, as I thought it might take a while, bought a B40 to ride.

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mike p5xbx
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August 13, 2019 - 11:28 pm
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The Lucas alternator is certainly suitable for 12 volt conversion you should get around 60watts out of it at 12v
but will need some wiring alterations and a regulator/rectifier
It has been discussed before if I can find threads will post them later

D? - D10- D14 Bantams 350 AJS -500 Triumph http://bsanotru.....lfire.com/

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grahamkeen1
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August 14, 2019 - 10:05 am
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Mike,

Thank you very much, appreciated,.

Regards,

Graham.

D1 Renovation; had it for 50 years and thought I ought to start :)

However, as I thought it might take a while, bought a B40 to ride.

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cocorico
Central France
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August 14, 2019 - 1:27 pm
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** Please log in to view **

1956 D3 awaiting a new magneto. 7 other bikes in the Barn, 6 runners and a still in progress Morini 250

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grahamkeen1
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August 14, 2019 - 3:38 pm
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Thanks Cocorico,

There's a lot of information there; should keep me going for a while 🙂

Regards,

Graham.

D1 Renovation; had it for 50 years and thought I ought to start :)

However, as I thought it might take a while, bought a B40 to ride.

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cocorico
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August 14, 2019 - 5:16 pm
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It's often down to knowing how to search the forum effectively. If you use some keywords for your query in the following, typed into your browser query box, you stand a better chance.

your keywords site:bsabantamclub.com/forum

1956 D3 awaiting a new magneto. 7 other bikes in the Barn, 6 runners and a still in progress Morini 250

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Lone Wolf
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August 15, 2019 - 12:48 am
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MOSOGER said
Hi Clodhopper..

I did the same conversion to my lads D1.. and all is fine.

I have the diagram's etc but I believe the copy rights belong to Lone Wolf. (CUE LONE WOLF)

He will surely see your thread and respond, rather than me take any credit. thumbs-uptip-my-hat

And as a bonus it will be in colour.smileor look up Lone Wolf's posts where you will find it.

Regards Bob.  

Wotcha.

You rang ?

 

My wiring diagram is only suitable for the alternator D10 / D14 / B175   ( and anything else that used a similar alternator )

The three speed Bantam electrics are something I've never worked on - other than to fit Electrex World systems for folks.

^..^

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grahamkeen1
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August 16, 2019 - 10:09 am
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Thanks Cocorico, good tip.

Graham.

D1 Renovation; had it for 50 years and thought I ought to start :)

However, as I thought it might take a while, bought a B40 to ride.

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