Intermittent No-Crank Condition

[markinms]

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

 

[General karthief]

What happens when the 'no start' condition arises?
nothing or maybe just a 'click'?

 

[markinms]

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

 

[General karthief]

Ihttps://www.stangnet.com/mustang-forums/resources/no-crank-checklist.64/

 

[markinms]

Thank you!