I'm having a problem with my 2009 F250 with 5.4 gas engine starting when at operating temps. When cold starts fine, but when hot it has no crank and no start. the lights on the dash come on as normal, just no crank, no clicking, nothing. I've replaced the ignition switch, starter and every fuse, relay and diode related to stating or cranking. I just don't know where to look next, can you help? Thanks is advance.

 

If you had a multimeter or voltmeter , you could prove what I am about to suggest.

Poor quality connections are easy to find and verify with a meter, but since we don't have one, we need to start at a beginning.

Suggest you loosen and clean all connections starting at the battery . Both positive and ground connections.
Those connections will always be in the pix until eliminated.
Let us know how you make out with this, thanks.