Intermittent No-Crank Condition

Intermittent no-crank condition. Sometimes it'll start, other times it won't.

I've replaced the key tumbler, ignition switch, starter relay, and transmission neutral safety switch. Battery is fully charged. No improvement.

I get power to the starter relay when key is turned to the "start" position. Verified with a test light.

I'm currently by-passing the ignition switch. I've installed a push button starter switch connected to 12V and run straight to the starter relay. Now I just turn the key to the "run" position and push the starter button I installed.

I'd like to get this fixed correctly. Any ideas or suggestions would be greatly appreciated. Thanks!
Mark

Nothing happens. No click at the starter relay. I turn the key to the "start" position and nothing happens.

Thank you!