I finally found the Bob Skelly wiring upgrade, which I used to modernize my electrical system. It’s for alternator equipped cars…I believe Bob’s OTS was an S1.5. I modified it to fit my needs when I installed the AC and alternator in my S1. As you can see, the heart of the design philosophy is to separate switched and unswitched loads and place the switched loads on a new 100 Amp relay. The key merely closes this relay instead of carrying high amperage loads. I added an emergency bypass in the event the large realy should fail. The number of additional relays and modern fuses is up to you. It can be implemented without modifying the original Jaguar looms (I did it). Bob’s parts supplier was Waytek. He had this on his now defunct web site some 15 years ago.
Bob Skelly wiring diagram.pdf (738.9 KB)