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D1 Lucas
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neddyo
Adelaide, Australia
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February 9, 2019 - 7:42 pm
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Hi All,

Has anyone nutted out how to fit  a rec/reg to a D1 Lucas please

Thanks in advance

Cheers, Nick

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Blue Heeler
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February 9, 2019 - 7:54 pm
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Nick, some of us rely on you for your knowledge on electrikery....and you`re asking us ! 😉

Regards

Blue

P.S. This would interest me too, as I have one of these D1s. Not looked at a wiring diagram yet, but will later.

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swalsh58
St. Mary's Bay, Kent
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February 9, 2019 - 8:49 pm
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I bet Sunny knows, he is good with electrickery. 

Current bikes......1958 D5, a 77 Suzuki GT250 and a 77 Honda CB125S. I have a 74 Kawasaki KH400 and a B175 waiting for restoration. A 1980 Honda CB400N waiting for MOT.  Everyday ride is a 2011 Harley Davidson 883 Sportster. 

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richard hyatt
Shaftesbury, Dorset.
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February 9, 2019 - 10:32 pm
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Hi , I'm unsure , but I think you can rewire the coils and use half of these little rectifier to give you a dc output

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mike p5xbx
E-Sussex
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February 9, 2019 - 11:13 pm
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Well funny enough in a part of a thread you posted in 2013

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and

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

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neddyo
Adelaide, Australia
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February 10, 2019 - 1:28 am
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The D1 Lucas is my favourite Bantam, I think it is smoother running

than Wico models.  Mine has just one problem I've never managed 

to fix. On a run longer than a few miles the amp meter starts to flicker, 

it seems move from showing what you would expect the charge

rate to be to what it would be with the alternator disconnected.

I've checked and rechecked all the connections, had the switch apart

and cleaned the contacts. what ever I do it is ok on short runs but

not on longer runs. 

Nick.

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cocorico
Central France
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February 10, 2019 - 9:01 am
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In case anyone misses it - that first link from Mike has LOADS of Lucas info and a good link from a  member we've not heard from for a while.

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Thanks Mike.

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sunny
Norfolk
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February 10, 2019 - 9:40 am
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hi  Ned  i worked  for Sangamo   Weston   as   a  lad  with  small  meters   althow   thay  wre   known  for  plans &ships  & so  on  thay  never  recamened    AMP meters  for   M/ Cycles      as  thay well  get  damaged     as  well  Lucas meters   so  its  a chance  the  guts  are  boken  making  it moor   activ    with vibration    

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neddyo
Adelaide, Australia
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February 10, 2019 - 10:15 pm
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Thanks Sunny,

I agree about the meters getting damaged but the thing that baffles me

is it seems ok for the first few miles, maybe something happens when

it warms up.

I have a Sangamo Weston light meter, had it for over 60 years and it still works

not that i use it in this digital age.

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Megga
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February 11, 2019 - 6:57 am
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Regardingg fitting a reg/rec. I have limited understanding of the electrical system, But isn't it just a case of connecting the 3 wire from the genny straight to the usual 3 yellow wires to an aftermarket reg/rec. After that the rest of the wiring is straight forward, just take a feed from that straight to the ignition switch.

This is something I have given a bit of thought about as I have no wiring loom or correct switch for my D1 lucas. So putting a U39 switch on (as they are widely available) and make my own loom up, fitting a reg/rec would simplify things no end.  

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cocorico
Central France
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February 11, 2019 - 8:09 am
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IMO, if you are thinking of replacing the loom and using a reg/rec your best option would be to change to a 12V negative earth system whereby you can use one of the cheap generic reg/recs. Looking back, I see that in mikep5xbx's first link he mentions a direct connection from generator to a rec/reg.

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Megga
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February 11, 2019 - 9:47 am
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A 12v negative earth would be better, but I would imagine getting a 12v alternator for a D1 lucas would be very hard to find.

I'm building the loom myself as looking on the net, I could only find twin switch looms. Plus I can keep to the correct colours as on the wiring diagram.

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sunny
Norfolk
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February 11, 2019 - 10:24 am
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Sorry  Ned  & Meg   I  carnt  find  any  info  on  sit  about  fiting   a reg/rec   to Lucas  genys  or  dyagram   so  i hope  im  won  it may  not  have been  done    ,the   normal  system   uses  3  out  of  the 4  contacts   on  a  new  bridge  rectyfier    that means  it  its  a  Duble   !/2 wave  syste m  also haveing   a  resister    in    it ,,     wypac   is  the  ezy   system  to change  to 12 volt neg  earth      , the earth  of  a  simple  system  is  controled by the sparkplug as  the plugs   we  use   are    POZ  EARTH    so  not  much  point   then     

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mike p5xbx
E-Sussex
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February 11, 2019 - 12:05 pm
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doesn’t anybody apart from Cocorico bother reading links!rolleyes

After reading the Lucas service sheet its clear that you can get the full output of the Lucas alternator on terminal G1 and G2

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this is just the same principle as joining the Yellow and Orange on the Wipac alt to get full output and 12volt
and just the same, you can connect the output to a Regulator/Rectifier and use Positive or Negative earth and 6 or 12 volt
and this is the post from robitibob that put it into practice and shows it works

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Mike

edit
and this is a very quick circuit diagram of how to wire it
use it with original to see what wires to remove
0wmrxh.jpg

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

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