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Thanks for those - the NATS one is the one I had found already and wasn't convinced about because it only shows that one wire going to "NATS Immu". Am i barking up the wrong tree thinking that is the "brains" of the NATS system or is that just the coil that reads the key? Or is it that there are other wires on the plug to that thing but they aren't seen on the diagram to keep it's workings secret?

Iain