Okay, pretty straight forward and agrees with the other wiring stuff that is more or less accepted around here... ( see Thorn's master copy of the colors that go everywhere . . . )
The heart is basically the flywheel... and the pickups sense a weak field spike which is fed to the IC Ignitor. The IC stands for "Integrated Circuit" which in essence means it's not going to get fixed, and they ain't gunna tell ya what's in it...
... but... what is in it is two things, and possible both are the same ( which they probably are since it's cheaper to design than kludge ). There will be an amplifier/signal shaping circuit inside, basically a transistor and it only needs one, but they probably have four to provide various things like stability, regulation, and other kewlies wave shaping things that keep the circuit "safe". So... in essence, you can think of the IC as just yet another relay, but it's just special because the weak little guitar pickups down there by the wheel, get amplified just the same as an electrical guitar but... with a fuzz-box, ( seriously ) because they probably want a square wave hitting those coils ( just a guess ). The square wave has the hysteresis characteristics to give that coil a "time shaped charge" ( so you get good fire, fast, exactly when they want it, no sooner, no later then POOF, off in a flash. The coils are fed by the battery but only after it goes through the stop switch and the ignition switch ( the key ). In essence, the key and the kill switch do exactly the same thing, in opposite tandem. The JB doesn't do jack squat as far as the coils go.
Been up awhile, about ready to crash, so... obviously i stand corrected in advance. Hope this helps.