That makes sense to me but.... Pickups have the Resistance on them not the number of wraps, Also older pickups used thicker wire than new ones. most likley the wrap thing you spoke of. All In all from a working mans veiw the solid wire is "brittle" compared to stranded, it is stiff and hard to work with, when it breaks its broke, stranded is " more versatile, it handles movment better. It is a better choice for "vibrating" applications. Thats why its used in cars, motorcycles, etc. In a guitar .... who knows, the run is short, I personally use automotive wire it seems to be more "workable" to me.