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2005 Ford F250 want start. Ran fine the night before. Went out to crank it and it acted like a battery problem. But both batteries are good.
 

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2 things make a truck not turn over. bad batteries and poor ground. A battery that shows 12 volts doesn't make it good. A battery can have 12 volts but as soon as you turn on the key and glow plugs come on then the injectors need to come on then the starter needs to turn that monster over and no power. Headlights are not a good indication that batteries have enough amps to get the job done. You need to do a load test. If your batteries are more than 3 years old than it may be time to replace them.
 

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Find the yellow with light blue striped colored wire which is adjacent to the passenger side battery in the engine compartment, it is near the vacuum pump. It has a "squeeze-and-pull" type connection. Disconnect it, and jump the male end of the connector to the passenger side battery positive terminal. The starter should crank. Leave the key in the off position to just crank.​
PICS for cranking w/ the starter solenoid wire:​

 
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