Thanks Matthias and Joules .
I am ashamed to say I was not even aware there was a seat interlock system . The car had most of the warning relays stripped out of it when I got it and I got it as a rolling shell. Thank you for the diagram. That rewiring looks a huge task!
6997 has been in pieces now for a neat 30 years , having been disassembled in 1991. I have been on it now for 18 months. I have rebuilt the mechanical in full including all the suspension , and the car is drawing ever closer to being able to be restarted.
Electrically I have so far installed all of the ignition, lighting, flasher, air conditioner control upgrades from Jon from PE , and his fuse box , as well as the PE engine management system and alternator and starter upgrade .( I may have to open an agency for him!) The ammeter / voltmeter change out and head light lift upgrade has been done. I finished the radiator fan controller unit and thermostat upgrade wiring today which looks solid. I still have to install the Tesla electric park brake controller unit. Then that's pretty well it.
I have pulled a mile of 30 year old retrofit wire out of it and there is still more to go.
It very close to being able to be started but I am trying to ensure there are minimum remaining loose non terminated ends before I do it. I have no doubt there will be a few issues when I eventually turn it on !
I am not sure if there is a accepted best way to progressively re-commission what is effectively a new electrical system ? Turn it on and hope ? Did you have a preferred sequence or check sheet you may have developed ?
I have started to do it with a 2A fuse in line to try to avoid any blue smoke .....