First problem. 2weeks prior cluster started act weird and gauges stopped working. Now truck will not start. Changed out computer with a running truck and still will not start. Had someone tell me the fuse box could be bad. Swapped it out with a running truck. Swapped out cluster to with a good one. Still noting. Checked power and grounds at computer on engine. Checks good. No power at lift pump on filter housing. Ground shows good. Cluster still not working. Any idea where to start looking. Need wiring diagrams or something. Also no communication at data link connector. There is power there. Won't commicate.

 

Here is a website for the 2004 service manual should have wiring diagram
just need to copy and paste it

http://www.mediafire.com/view/8k5u7y...ice_Manual.pdf