Er, in stating that the D and F wires need not extend beyond the cutout I meant for basic charging. As apparent from all diags, the D does need to be extended (in thin wire) to the dashboard for the ign light.

If John Cornforth ever reviews his very useful circuit diagram, showing the main current wires thicker would further assist understanding. And I suspect many would appreciate a slightly adjusted version for the RP (not to mention all the others).

Location: Auckland, NZ

Thanks Bob for the further comment. I'm glad to say that after your earlier advice I've got all the wiring sorted and the car is now generating a healthy current on both summer and winter charge - activated by a small toggle switch. General relief all round! Many thanks.

Location: Sheffield

Hi Chris.

As the Yanks say “’you’re welcome”.

Make sure the charge is not too healthy!
Dismantling the original switches is a challenge. I gather the simplified switches are readily available and a practical alternative, although the much reduced number of terminals puzzles some. (In effect the left side of the switch in the Cornforth diag is absent, and some of the other terminals are not duplicated or ommitted).
Curiously the likes of the Ford 8Y did not offer the summer charge option, despite being more likely to be used for long drives.
(I could have answered the original enquiry immediately but waited for 60 others to waste their time and pass over so I would not be accused again of trolling.)

A 3 watt stop light alongside another 3watt is near undiscernible even on a dark night. Considering the extra components involved and introduction of yet another adjustment, I wonder why they bothered.

Nights definitely were darker. On an overnight bus trip through the centre of the NI twenty years ago I was amazed at the degree of lighting in the small hours. Many minor junctions are now floodlit. In the 1950s the small "villages” had just occasional incandescent lamps but now fluorescents and street lighting everywhere.

Location: Auckland, NZ

Oops, those last comments attached to wrong post and I cant shift.

Location: Auckland, NZ