My engine will not crank over?

I turn key, nothing. Turn again, one unh sound. Another turn, woodpecker clicking sound under dash. Another turn, unh-pause-unh-pause-unh unh-then it turns over and starts. Sometimes it starts in ten seconds, sometimes thirty seconds. Usually I am nervous if it will start at all. I use the truck to haul horses. First few times it did this, I tried to boost truck because I thought battery was drained. It was not. Thoughts?

Thanks, Danny. I hooked a battery charger to the truck and it shut off and showed full charge after five minutes but truck was again stubborn to start. I am going to video the starting to help and I will post that later today. It is my farm truck for hauling hay, straw, feed and horses and I only put about two to three thousand miles a year on the truck. Would an engine scan help at all or is that mostly for engine issues? It did not pick up compression problems in my last car so I am skeptical. Thanks, again.

Audio for starting issue attached.

When I turn key hear one click at fuse panel and one click back of cab assume is fuel pump. Had battery tested. Good. Checked all fuses and relays, all good. Replaced starter and solenoid. Still no crank no start. Unable to pull any codes using OBD2, says communication error. Any ideas of what to check next?

Battery post are clean, power to solenoid and starter is good.

The truck randomly will not start. Stick the key in twist and all the lights cone on the dash. Turn it and nothing happens. Lights don’t dim or go away. Other times it starts perfectly. Weather doesn’t seem to be a factor.

The shop I took it to replaced/reprogrammed keys, the halo rfid reader in the column and reprogrammed all of the modules according to them. The also combed through the harness and fuse block and didn’t find any problems. Someone suggested I change the starter so that was done. I have played with the gear selector to see if a park safety switch could be the problem. I even parked it. Started it again in the evening and didn’t touch the shifter, then tried again in the morning and it wouldn’t start. Tried starting it in neutral, this didn’t help either.
I have owned this truck since new in 2005. I have never had issues with the starter.

Some history. It is on its second motor. It’s been in there for about 5 years. It came out of a 2001 Mustang and we had to change the flex plate. The aftermarket ones kept breaking, and we replaced with a junkyard new one that has been fine ever since. Motor runs well, with an oil leak from the pan.

So just check the seating of the relays?

Engine will not crank, relay makes no noise when key is turned.
Starter/ignition relay have been swapped, also ignition/starter fuse's have been swapped, all function properly in other spots. When Key is turned from run to start radio/security shuts off, blower motor/lights stay on. But no crank or relay click. Display reads "CHECK GAUGES". Also engine and wrench warning lights are illuminated. Battery reads 13V. Truck didn't go into limp home mode prior to shutdown. What could it be?

I am had the exact same issue it was the starter motor

Ford f150 Truck! Not a 500 car. 5.4v8 will not start. Terminals are clean and tight on starter and.. Battery.. All power is on except the starter will not engage and showed no signs of any problem with starting before. Just dead, all electronic working full power. Is there a solnoid for the bendix? Where loocated. Is there a circuit breaker or relay to quit without warning?

Truck just quit running and now it will not restart head lights and flashers work, but radio and turn signals do not and will not come out of park.