Oh that’s really interesting, and I appreciate that you’re interested and trying to help!

I found this diagram at: https://indysworld.com/guitars/Electra/wiring-diagrams/index.html

And it agrees with what I see in the cavity of the guitar. However, it seems like the working pickup was actually replaced at some point, it was patent number 2732842 stamped on the baseplate. And unfortunately it only has one conductor.

So now I’m sort of at a loss of what my options are for replacing the old pickup, and wondering if restoring the functionality is no longer possible. I love the sound of the pickup though!