David Williams funky guitar tone with humbucker pickups?

[Hot Vibrato]

I am almost positive that that's a strat equipped with single coils, in the 2 position (bridge and middle pickups together in parallel) - it's a distinctive sound. Single coils sound more jangly (for lack of a better word), which is what I'm hearing in the track that you posted. A bridge-position humbucker can provide a good funk tone as well, as long as it's not a real hot, overwound metal-head/shredder kind of pickup, but that's definitely not what you're hearing on that track.

A stock strat is a good choice for funk music in general, but any guitar that can yield a bright clean tone is a good candidate for funk. Usually the bridge pickup is best, or in the case of the song you posted, the bridge pickup combined with the middle pickup.

P.S. Many of the japanese strats I've seen have 3 single coils. Don't overlook the more modern Mexican strats (Standard Stratocaster), some of which can be had for not too much money.

[Igotsoul4u]

that clip sounds like the neck pickup of a standard strat. David is awesome. My strat is signed by him!!

[kafka]

Originally Posted by Hot Vibrato

I am almost positive that that's a strat equipped with single coils, in the 2 position (bridge and middle pickups together in parallel) - it's a distinctive sound.

That's exactly what I'm hearing. It's not just the pickups, it's the way a Strat spanks. I have split coils on my LP, but there's no way to get that sound from it.