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Sorry for the delay. I'm pretty sure I tried moving the shifter to neutral and it wouldn't crank, and My bro just tried again. He said it will not shift out of park unless you press the brake pedal, and the gauges are coming on with the key on. I suppose the park/neutral part of the switch is...

NSBU.... Nuetral safety back up?

I'll have him check about the shift interlock. I'm pretty sure the gauges came on and did a sweep or something when the key was on, and did it again each time the key was turned to start and released.

I did pull the fusebox up and checked for bad connections and what not. Swapped relays around also. I think it may need to go to the stealership. The lock symbol does not show on the dash display.

But I am getting power from the ignition switch to the ecm.

Thanks for the responses, guys. It does not have a CEL. I have some experience with Snap On scanners and what they are and are not capable of, but I have been out of the business for a few years. Would one of the Actron scanners be able to tell me why the computer isnt letting this thing turn...

I've been working on my brothers 04 6.6 trying to figure out this no crank situation. I found a wiring diagram and tested some things. It appears the ecm is getting a signal from the ignition switch and is not grounding the starter relay. I can manually ground the relay and it will crank but not...