Wiring
Wiring up this guitar is pretty straight forward, as it only has one volume, one tone control, and one selector switch. However, we planned to replace the original pickups with two Seymour Duncan P-Rails. These pickups are basically a humbucker, but instead of two similar sized single coil units mounted side by side, they consist of one P-90 style unit, and one skinnier single coil unit (because the P-90 unit is wider, with more windings than a standard single coil unit). The 'P' is for the P-90, and the 'Rail' is for the skinnier single coil unit. The primary attraction of this pickup is the ability to switch between a Humbucker style pickup, and a P-90 style pickup. One other option, with proper switching, is to use the Rail as the single coil option, which is what we did. First, we had to remove the old pickups and controls.
Original control wiring
Broken pot
We settled on a schematic we found on the Seymour Duncan site, here. We liked this setup because we could get all 4 possible combinations of the two coils using push-pull controls for the volume and tone controls, and would not need to drill any new holes in the guitar for additional switches.
Wiring diagram for the P-Rails
We used a scrap piece of wood and made a jig to hold the controls while we wired them up. Here you can see the push-pull pots we used. Each control has a DPDT push-pull switch, which is sufficient for the above schematic.
Wiring jig
Closeup of the push-pull pot (tone control with cap installed)
Once the pickups were installed, and the wires fished out through the f-hole, we wired them to the control switches, fished the harness back through the f-hole, and mounted them back in their corresponding holes. Installing the knobs finished up the process
Wiring harness and P-Rail pickups installed
OK! We are ready for the final assembly...