There are one or two useful illustrations of the switch floating about on the internet. These are of value when sorting problems like this.
I’m going from memory here, which is rarely a good thing with me but search out Dieter’s web site. He has an early diagram of an f, this doesn’t look much like it’s successors but the basic key switch wiring is the same throughout the cars.
If I recall correctly, it had a block diagram of what connects to what as the key is turned; later diagrams omit this, again if the memory serves.
To others reading this, it is worth looking up Dieter’s site, some of it is inspired.
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