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No crank / No start

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Old May 16, 2023 | 08:21 PM
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From: Dallas, TX
No crank / No start

A few days ago I went to start my truck and when I turned the key... nothing. I did my research and without any way to test for voltage I decided to go ahead and replace the starter solenoid, it didn't help. I did more research decided to go buy a nice meter and continue to search. I tested for voltage at the wire that activates the starter solenoid and nothing. I ended up replacing the ignition switch because it was cheap and the neutral safety switch neither fixed the issue (including cleaning the connections). So now to the real question. It has to be the wire itself right? There isn't anything else that could be stopping the starter relay from being activated and starting the truck or am I missing something obvious?
 
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Old May 17, 2023 | 06:56 AM
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am I missing something obvious?
Yeah, identifying what you're working on...

 
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Old May 17, 2023 | 07:02 AM
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Its a 1999 F-250 SD with the 7.3 turbo diesel and 4 speed auto.
 
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Old May 17, 2023 | 08:54 AM
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Go read this thread. Same problem, will get you going in the right direction. Read the whole thing, there's also a diagram there. https://www.ford-trucks.com/forums/1...-no-click.html

Only obvious difference between the gas and diesel circuit is the second battery.
 
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Old May 17, 2023 | 07:27 PM
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Okay so after work I decided to try manually moving the ignition switch and it didn't start so it wasn't the mechanical portion. After that i decided to test and make sure the ignition fuses 20 and 21 are getting 12v and they are but still no voltage at the starter relay control wire.
 
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Old May 17, 2023 | 08:56 PM
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Continue half-splitting the circuit between F20 and the starter relay's S terminal until you pinpoint the open circuit.

 
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