Hello Koalar,
I didn't say that I was trying to sell the car. The auto electrician had supposedly fixed the short and fitted a new battery. It was advertised, and I had a couple of viewings but the new battery then ran down after a couple of days. Not the best thing to happen in the middle of trying to sell. That is why the auto electrician was due to look at it again on Friday, and I was trying to investigate as much as possible myself before his second attempt.
To my surprise someone came to view on Thursday night despite being told about the short. He made an offer which was acceptable to me and yesterday came over to complete the deal.
With your last post and the diagrams I had assumed that it was a hopeless task for me to try and fix, even with your advice, but sorry not to have reported back sooner.
I do appreciate your effort and knowledge. Trust you don't feel it was time wasted.
Thank you
Victor