A wiring diagram appears in the handbook, downloadable from the major supplier and other sites.
I guess what you really want is something akin the Cornforth circuit diagram for the Ruby, which shows internal switch links etc and enables a grasp of how it all works, without having to piece together and draw for yourself from the wiring diagram.

Location: Auckland, NZ

Jez,
I have drawn up two for my RN: one for conventional 6 volt lighting, the other for the 6 volt LED 6 volt version, both including brake lights and flashing indicators. Let me know which type you require and I'll email you a pdf file.
Andrew

Location: Netherlands

Hi Andrew - that's very kind of you. The conventional 6v diagram please.
Kindest regards,
Jez

Hello Andrew and please forgive me for crashing into your messages.
I have a 1931 RN (1932 model) that has standard 6 V wiring at present but I would like to obtain more information about LEDs. Any chance you could send me your PDFs?
Whereabouts in the Netherlands are you, I've just returned from an 8day holiday to North Holland. (which used to be called West Friesland)
Regards, Brian

Location: Near M1 Jtn 28 (UK)

Brian,

By now, Jez and you should have received the RN wiring diagrams.

I live just south of Amsterdam, not far from the amazing Cruquius Museum, which was built about 150 years ago as a pumping station to drain and reclaim the Haarlemmermeer area. Its Cornish-type steam-driven pump, boasting a massive 144" cylinder bore, went out of service in 1932 - just the cheeky little four cylinder effort in the foreground was being run in.

Come and see both machines next time you're over.

Andrew

Location: Netherlands

Andrew, wiring diagrams received with many thanks. I was in North Holland last week on holiday and had intended to visit Crucuius but it was a little too far away from Schagen so has been saved for another day.
Thanks for the kind offer to see both machines, we are frequent (but not frequent enough) visitors to the Netherlands so shouldn't be too long.
Kind regards, Brian (and Sue)

Location: Near M1 Jtn 28

I am the author of the Ruby wiring diagram hosted by the Dorset A7 club. I hope some time to sit down and do another for the earlier cars. By coincidence I visited the Cruquius pumping station last week on the way through the Netherlands to Denmark by motorhome. It is a work of art and well worth making a detour to see.

Location: North Denmark

Hi John.

Wheel it on please. The ideal outcome. Most sources are woefully lacking in circuit diagrams and so make the very simple seem complex. Unless experienced with electrical work and able to visualise in their head, most will find it necessary to draw a circuit diagram before fault tracing or making alterations, and a published diagram avoids the d.i.y tedium.

In any assembly of key articles John’s Ruby diagram should certainly feature. Furthermore John has updated his drawing to clarify and correct, a feature lacking in many other articles.

Another key electrical article is the Cornwall Club “ A Charging Refresher” which ideally requires renaming “Austin Seven Charging Circuits” or suchlike so in the vast mass of info it is not bypassed as being about battery rejuvenation. Ideally that article needs a more clear association of the diagrams and words, and, as repeatedly pointed out by Tony P, alteration to eliminate the confusion about two stage charging on early models.

Location: Auckland, NZ

I am having real problems rewiring the (1934 pattern) replacement ignition switch on my 1932 Box Saloon. Would the wiring diagram mentioned above throw light on the problem? - which essentially centres around the Half/Full charge dilemma.
Any help would be greatly appreciated.
Anthony

Location: Central France

The first thing to do is to identify the type of dynamo fitted, which in turn defines the location of the full/half charge resistor. It should, theoretically, be possible to fit a later ignition switch to an earlier car, but, like so many things A7, theory doesn't always suffice!

The article mentioned by Bob above http://www.austin7.org/Technical%20Articles/A%20Charging%20refresher/ is a good starting point.

Location: Deepest Norfolk

Thanks very much Rick. I believe that the dynamo is a C35C which has two brushes. It was refurbished a few years ago and seems to work well. I shall digest the article to which you referr in the next day or two, but as my knowledge of electrics in general and car electrics in particular is very poor, I will have to read it VERY SLOWLY!
Best wishes,
Anthony

Location: Central France

Hi Anthony

The Ruby diagram is very close to the RP and the inner workings of the rotary switch are made apparent. If the original switch has been replaced by a simple version without the Summer facility then there are posts covering that.

A 2 brush dynamo indicates mods, with all the confusion which goes with these if not documented with the car. Car may or may not retain a two stage facility, or may have acquired a regulator of some sort etc, all of which can make it difficult for amateurs.

Location: Auckland, NZ