Below is a diagram for the wiring I currently run in my Stratocaster which allows a lot of switching possibilities beyond the standard 5-way switch. The diagram is a further modification of a Strat wiring diagram I came up a few years ago which is in turn based on the Guitar Nuts' Strat-Lover's Strat diagram with the addition of a "Neck-On" switch also available from Guitar Nuts. The circuit also includes a phase switch for the middle pickup. My starting premise for wiring mods in all my guitars is that I want the guitars to look stock rather than to drill holes or rout for new or additional switches. This is best achieved by using either a Fender S-1 switch (which are expensive and the knobs don't look stock), or push-pull pots. All that is required to do this modification is the purchase of three 250K push-pull pots (Fender
part 0992257000) available online from parts dealers for about $12 each, extra wire, and soldering equipment. With all switches down the circuit functions as a normal Strat with 5-way switching. Pulling up volume knob adds the bridge pickup in series to whatever pickups are selected via the 5-way switch. Pulling up the tone 1 knob puts the middle pickup out of phase. Pulling up the tone 2 knob adds the neck pickup in parallel to whatever pickups are selected via the 5-way switch. The switches do work in combination, but there are several combinations which are redundant. The new pickup combinations that this circuit allow are:
1. neck and bridge pickups in parallel (tone 2 switch on and 5-way switch in position 5).
2. neck, middle, and bridge pickups in parallel (tone 2 switch on and 5-way switch in position 4).
3. bridge and neck pickups in series (volume switch on and 5-way switch in position 1).
4. bridge and middle pickups in series (volume switch on and 5-way switch in position 3).
5. bridge pickup in series with neck and middle pickups (volume switch on and 5-way switch in position 2).
The middle pickup phase switch can be used at any time to add to the variety of tones selected above, or with standard 5-way switching (think Jimmy "Chicken Stratch" Nolen and the JBs). It would be relatively easy to modify this circuit by swapping wires so that the volume switch adds the middle pickup in series rather than the bridge pickup which would result in the combinations of bridge and middle pickups in series and neck and middle pickups in series. You could also swap wires to add the bridge pickup in parallel rather than the neck pickup. If your middle pickup is reverse wound reverse polarity then you will have humbucking in both series and parallel. I really like the sound of the neck and bridge in series and in parallel, however, and the diagram below allows both. The circuit may seem like overkill, and more importantly like bowl of spaghetti in your wiring cavity, but it's fun to try different wiring schemes. Leo Fender's original Strat wiring included only a three-way switch, selecting each single coil individually, but there are many more possibilities.
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