30-07-2022, 10:00 AM
(29-07-2022, 08:07 AM)andrew34ruby Wrote:(28-07-2022, 10:34 PM)David Stepney Wrote: Yes, if your car is negative earth, then my instructions should be reversed. However, I think your car should be positive earth. I am under the impression that the cars changed from negative to positive earth upon the introduction of the Ruby in 1934, but I am happy to be corrected on this.
Sorry to correct you David but I think the change to positive earth was a bit later. Looking in 'The Austin Seven the motor for the million' R J Wyatt tells us that Ruby production started in July or August 1934, but the polarity change was introduced in December 1935.
My Ruby has always been negative earth, first registered December '34.
Thank you Andrew. I wasn't sure, and I didn't have my copy of Wyatt to hand when I wrote my post