spark issue mystery on 84 chev

[ray_mcavoy]

That's most likely a problem with the ignition switch. The "IGN 1" terminal (pink wire) should have power in both the "RUN" and "START" positions. It sounds like your switch is no longer powering that terminal in the "START" position.

The starter solenoid wire connects (through the neutral safety switch) to the "SOL" terminal. That terminal only has power in the "START" position and is only used to crank the engine ... it doesn't feed power to the ignition system.