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June 14, 2020
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Hello Comunity
In 2016 I could buy a 125ccm D1, dissassembled and in 4 boxes paked. In January 2017 I recieved the certificate from owners club. Until end of 2017 I build up the bike without the electrical part... Since then I had no time to work on the D1. And now "thanks" to Corona crisis I a have time to work on it again.
I try to upload the pictures again (after failing another second time). I try it now with chrome.
before:
now:
Regards
Ernst
November 16, 2011
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Great progress Ernst. `Rona`s not all bad then, at least not for Bantams coming back to life.
June 14, 2020
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I try to upload the pictures again...hope dies last
June 23, 2013
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If you can post a picture of the generator side (zundung) we can identify your wiring, also your engine number (motornummer). Like this:
June 14, 2020
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Hi Cocorico
Ehre the serial and spec number:
And the Engine Nummeris BD2.5985
Hope it Hells.
Thanks in advane
Ernest
June 23, 2013
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That's great Aernoe, so you have Wipac electrics (Series 55 generator, spec 1130) and a 1952 engine (have a look ** Please log in to view **)
If the engine is original to the frame, your frame number would start BD2S. Member 'Sunny' will probably let you know what the exact wiring system for your generator should be - it all depends on the spec number.
Hope that helps - tschuss!
January 9, 2013
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hi Ernst you have a grate show of B S A s its very nice to see them , thanks for the photo s
your Bantams electrics is correct for the modle it is fited with a batery holder , the best wiering dyagram to look at is on page 81 of
[ THE BOOK OF THE B S A BANTAM ] or the B S A service sheets [ 808 B ] . The wiering to your D1 headlamp & wier code is new so a new BRIDGE RECTYFER will help the electrics work beter the batery wiering is know as a FULL D / C system ,. the 1130 geny was also used for NO batery Bantams let me know if need any help ,.,. Sunny
June 23, 2013
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In case you haven't already found this site on-line: ** Please log in to view **
June 14, 2020
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Great, thank you Cocorico and Sunny
I will do the next steps and send you a feedback.
Regards
Ernest
PS: The motor is original - see also picture "ownerscertificate". It's BD2S.9154
April 19, 2018
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...und herzliches Wilkommen im Club, Ernst.
The members' area is now open for you 
Stewart
'55 D3 Battery; '58 Square Four (project); '59 D1 direct lighting plunger; '59 Tiger Cub; '60 5TA; '76 FS1-E; '91 GTR 1000; '97 Honda Sky SGX50.
June 14, 2020
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Hi Cocorico and Sunny
@Cocorico
you wrote
you have Wipac electrics (Series 55 generator, spec 1130) and a 1952 engine (have a look ** Please log in to view **)
I had a look on the page and I got insecure. My engine number BD2S.9154 means 1953 in my view and not 1952 as you wrote.
Can you please enlighten me?
@Sunny
I do not have [ THE BOOK OF THE B S A BANTAM ] . I found different books in google but not with ecaxt this name. I found one with the name "The BSA Bantam Bible" ISBN 978-1-78711-136-3. Could it be this one?
I am also insecure about the 808B Service Sheet because I do not have a 3V Batterie....so it would be great, if you could help.
Thanks in advance
Ernest
January 9, 2013
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hi Ernst the 3 volt [ PARKING LAMP 2,5 volt ] Battery is only fited to the NO Batery systems but the bantam may have the Batery holder in the headlamp
and a Rubber boulb horn as yours has ,. so ser/sheets 808b also has the full D/C batery dyagram i think .,., im very sorry i donot have all the bantam books here ,. i think i will get my children to get me the 2 books for Christmas ., so ask if you need to please
November 16, 2011
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Here are some links to just a few of the many Bantam information sources Ernest....
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Adventure story that Bantam owners have enjoyed reading:-
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I bought this one for my collection in the 1970s, it is basic in its content.
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Regards,
Blue
June 23, 2013
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Probably brainfade on my behalf, Ernest. Best to contact the Dating Officer with your numbers, he should be able to tell you when the bike came from the factory and where it went to: ** Please log in to view **
If you PM me your email I can give you access to information on my 'Drive'
June 14, 2020
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Hi I am back after making my BSA B33 fit for "Road traffic licensing department". Now it's about time for the D1. I have checked all this electrical stuff and I am sure, that I have now the correct wiring diagramm (see attached picture). But I am unsure whether I have the positive or negative earth system. As far as I see in the diagramms, the only difference is the connection to the battery - isn't it? In this case I prefer the negative earth system, because it's more common in our area.
It would be great if someone could give me a feedback if I do a mistake or something breaks when I connect the battery in negative earth system.
Best Regards
Ernest
June 23, 2013
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To switch your D1 to a negative earth (assuming you are keeping to 6V and magneto ignition), you are right in saying the battery connections need changing, negative terminal to earth and positive to supply the horn and lights. The rectifier will already be connected + to battery +, - to battery -, but you need to check that the rectifier + is not connected to earth, eg by a mounting bolt. Best to have a fuse in the circuit, too.
January 18, 2020
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I am sure the original disc shape rectifier (as in that diagram) was positive earth, via the mounting stud so will be difficult or impossible to convert it to negative earth. You might do so if you could insulate the stud from the frame.
But we are assuming, does this rectifier work, the one on the D3 that I had did not, so it was replaced with a small modern rectifier, which could be positive or negative earth.
Mike H --
Murphy's 4th law of motion states that any small object that is accidentally dropped will immediately hide itself under a larger object.
June 23, 2013
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Number6 said
I am sure the original disc shape rectifier (as in that diagram) was positive earth, via the mounting stud so will be difficult or impossible to convert it to negative earth...
As I mentioned. However, if an original Selenium rectum fryer is still fitted, it's well worth replacing it with a modern silicon bridge.
June 14, 2020
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My D1 has a disc rectifier (see pictures). So it seems that I have a positive earth -correct?
June 14, 2020
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I found some marks on the old battery, which shows how the battery was assembled. It seems that the minus (black) wire goes on the frame and the red one on rectifier.
an now I am completely
Any help is
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