Hi TB, I'm looking for some help wiring a harness. I'm trying to use a 3-way switch with a Jazz bass with a set of 2 concentric "stacked" pots. I thought it would be similar to other 2-pickup configurations but the interaction between the pots seems to be creating problems. I have used this same switch in a P/j bass, but that bass had one volume and one tone. I've not used this switch with a "2 separate volume" configuration, although the Seymour Duncan switch diagram I was using did indicate this is possible. Every combination of wiring options resulted in no success. I'm stuck. If you have successfully used a 3-way "on-on-on" switch with a concentric harness, please explain how you did it, or provide a diagram. Thanks!