Not bad news at all, Chris. Surviving documentation on this product is so slim today, every bit of information is useful.
I rechecked the front panel ID on this Switchboard and can confirm the Product Code is Definitely R M Sierra Alpha 3897.
That rear view shot of the wiring will be very helpful. I have a friend in Steinbach taking photos of his as well for me to reference. First glance comparison to the wiring remaining in mine suggests what is still there has been significantly relocated. I will have to test what is still there to see if it makes any sense at all. I see at least one red lead going to a negative terminal so I will need to tread carefully. At this point, I cannot see a drastic rework of the wiring simply to add in two new sets of terminals. What was real may be fully bodged at this point.
My goal, pending discovery of MK I documentation, will be to simply mirror wiring of a basic 5C Switchboard into this one and leave the two sets of additional terminals on the Mk I empty until how they were originally integrated can be confirmed. Need to find two extra terminals for that detail in any event, but it should be doable.
David
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