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I just want to gut out my bass, and put in an ON/OFF switch. All I need to know which is the signal and ground. Ground seems pretty easy, it's that single wire that goes to the bridge. But the hot....I dunno. My bass has a a vol/tone setup, and a single MM-style pup. The wire coming from the pup has a red and white wire taped together, a green wire, a black wire, and an uninsulated wire. WTF? Why so many wires? What's what?

Going off of this:


If I were to wire straight to the output jack, I would just wire red/black to the tip, and green/white/bare to ground. And sleeve would also go to ground. Sound right?

yes. you've got a humbucker with separate leads for each coil and a common ground (bare wire) in addition to the negative leads from the PUs. if you were going to wire it for coil-splitting you'd have to figure out which leads go to each coil, but if you're not splitting then your assumption is correct. the sleeve is your ultimate ground connection in this case.