I did mention those 2 contacts in post 11I have worked out the 2 small black wires are the trigger, through those 2 little contacts behind the cowl, presume so machine won't start if nozzle isn't complete, there is also a thicker black attached to the air pipe connector in the machine which has continuity to the centre electrode, I can see a thicker red wire behind the nozzle but can't find what it connects to.
Here are a few images of the torch