Note that headlights won't turn on until engine is cranking fast enough to activate headlight relay from stator coils. Basically headlights won't turn on until engine's running.
Not starting can be power not reaching starter solenoid. Many segments of wiring can cause break and no starting. Measure for +12v at each of following points. Where +12v disappears is problem (or just before).
battery +terminal -> 30a fuse -> W wire -> ignition switch ON -> BR wire -> 10a IGN fuse -> BR/BK wire -> Y/R wire -> stop switch ON -> R wire -> BK/R wire -> start button ON -> BK/R wire -> diode B -> BL wire -> starter circuit relay -> Y/R -> starter solenoid
There is also ground side of circuit with interloc safety switches. We'll deal with that next if you find that +12v makes it all way to starter solenoid.
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