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I have a 2005 F-350 and my hubs are not engaging. I have tested the vacume lines and they are all in good shape. I have tested the solonoid and it works correctly and opportates the hubs when manually applying power to the center post and grounding one of the other post. My question is, is there a control module or a relay in this system? What makes me think there is, is the color coding on the wires from the swith to the solonoid are not the same.
 

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Stuck in Commiefornia...
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Check the fuses. Also, if you can, have someone get under the truck to listen and see if the transfer case is actuating when you turn the knob on the dash. It should go into 4H in any gear, but 4L you have to be stopped, and I believe in neutral or park.
 

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What I found that worked best is to,
1. Remove the factory hubs, throw them away.
2. Install Warn standard plastic hubs. (had the metal premium ones fail)
3. Enjoy!!!

Of course you will either have to keep your hubs locked in or lock them in when you need 4x4.

If I bought new I'd not get the 4x4 switch but rather the good old fashion 4x4control. All three of my trucks had vacume issues and hub failures.
 
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