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I'd start with the glow plug relay and the glow plugs.

The relay is the weak link in the system but if they have never been replaced the glow plugs may be bad also. A quick check for the relay is in the morning before you start the truck is to short the two large post on the relay for about 20 or so seconds and then try to start. Be ready for some sparks when you do it. I'd use a large pair of pliers to do it.

The first post in this thread tells you how to test them properly.

 
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