My dad has a '67 skylark with a V-8. It ran fine, then out of the blue the starter won't do anything. No clicking, no slow turning - nothing but the idioit light coming on the dash. We checked the battery with a hydrometer - was fully charged and all the cells were good. We also changed the solenoid (we had a new extra on for emergencies...), and no change. Might it be either the starter, ignition switch, or the neutral safety switch ? Thanks. Ray