I just wired up my ST-1 build, plugged in and... nothing.

My ST-1 kit came with three wires to solder in: all of them attached to the volume (not two attached to the tone as per the PitBull wiring diagram - see attached image#1).

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The wire attached to the lug is yellow, and the two wires attached to the top of the volume are both black.

Following the wiring diagram (and various YouTube videos), I see that the yellow wire is the "'hot' wire to tip" and the two back wires are both earths. Accordingly, I wired the yellow "hot" wire to the tip on the input and one of the black wires to the earth lug (see attached image #2).

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In accordance with this advice (see attached image #3)
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Then I soldered the other black wire to the bridge.

I double checked the wiring. I re-soldered the wires to check there was a good contact. Every time I opened up the jack cavity the wires were still attached.

I'm out of ideas. Any help appreciated
Martin