[kbryt]

thats it, problem solved.

[singleminded]

does your switch look like this?

[singleminded]

Try this...john

[kbryt]

well I have something that might help but cannot attach it to this post, are you on the face book site ? or pm me

[kbryt]

I'll see what I can dig out.

[johnguppy]

Yes it is an early Lucas three brush dynamo   

[kbryt]

is it three brush or two brush dynamo?

[johnguppy]

I am seeking the following information   regarding the wiring  on my bike  it has an early electrical  switch on the back of the headlight with an amp meter   , I am seeking a wiring diagram as its different than  most later headlamp switches so  any info would be a great help   
thanks john
my email is  johng@jgcoms.co.uk   if you would like to send direct