I have a 2005 1500 slt with 5.7L Hemi, I was driving down the hwy when the truck just shut off. I coasted off the side of the road put it in park and tried to restart it. Nothing. My flashers still work my dome light works. radio still works but that is the end of what works. I have checked all fuses and replaced the fuse box under the hood and computer attached to it. Can you think of anything else I need to check before I change the main computer?

Battery? Alternator?

Are your relays still good?
Cables and grounds?

battery is good, alternator was just changed. I have gone through and changed relays. I have lights, flashers, dome lights, radio. but nothing else.

Did you have the battery checked? Have lights and such, and the vehicle starting are two different things. Are you getting 12v to the starter?

Do you get any codes from the ecm? If you turn the ignition to "on" three times, the ecm will return codes. If it doesn't, most likely the ecm.

I had the battery checked and it was good. I also changed the ignition switch. Once I changed that it had a few more lights show up on the dash. Still not able to read the computer. I found that the wires going to the ignition switch have a lot of tape i think its where the remote start is wired into it. I am going to go through those wire in the morning

when was the remote start wired?
Close to the time frame this issue started?

no it has been in for about 6 months. but when i move wires in that cluster I can get the dash to work and then it did turn over the engine.

Also check the plugins for the remote start controller. I've zip tied a couple as they worked their way loose after some time.