I have a Les Paul Standard which has had BK Mules for years now. I recently re-did the wiring as one of my volume pots broke.
I've wired it completely standard, 2 humbuckers, 2 volumes, and 2 tones. No coil taps or anything. Both volumes work as expected until they're on zero. I don't get any guitar signal coming through just very noticeable white noise.
Grounding issue? How would you go about diagnosing where the fault is?