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What year f250 are you working on today?
Do you have a multimeter handy? I'm fairly sure I can help you through this.
There is a relay. There is also a lot of other parts that could cause this problem. Do you have access to a test light so we can narrow it down?
K. Good luck. We'll check in soon.
The first thing we're going to have to verify in this situation is the battery's charge and that all fuses are ok. Let me know once you get that done and we can proceed to dig a little deeper!
Those are also relays for what it's worth. It might be worth trying to switch the ignition relay with something like the horn relay and see if any of your symptoms change. The fuse and relay location can be found in the owners manual. If you don't have access to that let me know and I'll see what I can dig up.
Just stopping by to see how you're coming on the truck!
You should only be getting continuity through the relays when there when there is power to the other terminals, so they may or may not be working. Just to be clear all fuses are good and you're not getting any power to the truck at all. But before you had power to the truck and it only wouldn't crank. Correct?
Sorry I might be having browser issues.
Do you have power at any of the wires to the ignition switch?
And so I can be sure I'm not looking at the wrong diagram what engine does your truck have?
If all of the fuses are good we'll need to know if power is getting to the switch.
If my memory serves correctly (and this may depend on tilt of fixed steering column option) there should be like 3 or five yellow wires. Check them for power at the plug near the base of the turn signal stem. And if the switch was replaced recently couple check to make sure all of the pins are secure in the connectors. Ive seen them get brittle and break with age causing goofy intermittent issues.
Thanks for checking in. Looking forward to hearing what you come up with. No need to reply before then.
There should be power on at least one of the wires in the plug that goes to it at all times. The color of that wire if my diagram is correct will be yellow. It looks like there may be more than one. Either way we can worry about that later. If there is power getting to the switch then we need to make sure there is power on the red and light blue wire when the key is in the crank position. You will also want to give a light pull on all of the wires in the connector to make sure the retainers for the terminals are not broken inside the plug.