Well I take it that you know the Stewart-McDonald website, since you have the Black Ice module, on the website it says pickups should be 10K or higher, your Yamaha pickups probably fall somewhere around 7.5-8.5K , but you say the instructions for the Black Ice say pu's need to be 6k or more, so we have 3 possibilities, 1. Pick-ups too weak, 2. It's wired up wrong, 3. The Black Ice is defective, I would suggest to eliminate the possibility of 2., wire it as simply as possible, you might want to wire it up to your old tone pot, and slip that back in to test it, if that does not work, I think we can eliminate 2., I strongly suggest that you get a ohm meter (vom) Radioshack has a small one that will fit in your shirt pocket for cheaps, that will do everything you need it to do, an ohmmeter would help you determine 1,2&3 above, I also would like to suggest that you go to the Stew-Mac website, go to Free Information, and read i-4000, Understanding Guitar Wiring, very informative, so let me know how all turns out.......................Oh, Btw, if you want to check the pu's output, probably what would be the easiest for you would to put your pu selector in the Bridge only position, turn the volume pot to max, and if your can reach the output jack from inside your control cavity, touch one lead of the ohmmeter to one connection, one lead to the other connection of the output jack, if you can't do that, then one lead on the output lug of the vol pot ( the one connected to the output jack ), and the other lead to ground, ( the back of a pot ), from what I info I have dug up on your guitar it's factory wiring is as follows, Bridge-Full Humbucker, Bridge and Mid with a coil split off the Bridge PU, ( the coil split grounds one coil of the Bridge Humbucker so that it operates as a single coil ) Mid- single coil only, Mid and Neck with a coil split, Neck-Full Humbucker, Pretty cool wiring already there.....let me know your findings/results OK? Good Luck............