Here, try just attaching a 12v light, via alligator clips, to the IGN post of your ignition switch and a good ground. Then turn your switch ON. The light should be on. Now, try gently tapping the ignition switch with the handle of a screwdriver and lightly wiggle the key without turning it to crank or ACC. The object is to get the light to wink when it shouldn't. If you can get the light to wink with a wiggle or a tap, you've found the problem.
