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I used a tiny strip of electrical tape and tweezers to lay it on the positive terminal of the ISB connector
You know, I thought it was an "official" cable from Yaesu, but it's a Vertex Standard brand CT-62 adapter. its logo just looks a little like a YS. I put in an order last week for an XGGCOMMS cat & isolated audio adapter, so I'll be able to report back if that works well for me.
My problem with the pi powering up wasn't what I thought it was. I cut the positive wire in a usb extension cable, verified it was disconnected, and plugged in the adapter and the pi powered right up. Turns out I accidentally wired the power switch for the 12v-5v adapter that powers the pi into the ground wire, so when the usb adapter was plugged in, it connected the ground from the 5v side of the power adapter and it started pumping out 5v to the pi. Easy fix! Still might need the 5v disconnect for the usb, though. tbd...
@Chuck - that model was difficult to slice -> gcode. I got it to print, but it was too thin. I'll have to make another model later & have another try to make an insert.