1999 chevy 4.3v6 silverado, cranks, no spark and no fuel

Truck shut off while driving.
Had 2 misfire codes about a month ago
Rec a p1051 code

Replaced all spark/coil wires
Replaced coil
Replaced icm
Replaced rotor and cap
Replaced pcm

Clear code and rec P0366

Removed and cleaned up crankshaft sensor, reinstalled after new one didn't work either.

Code removed.

Installed new battery

Cranks, no spark and fuel pressure.
No power at prime port on underhood electrical box

Swap out all realys there with known good one, no change.

All fues there and on left side of dash OK, kindly advise on floor board fuse
Panel there are 3 relays what are they for?

Have power to devices and grounds OK.

Any advice ?

Truck down for 3 weeks now, hate to take to shop feel I can repair.

Did you use a test light or multimeter to test for power through all under dash fuses, when the ignition switch is turned to ON? If there is not power at the fuses, even though they are not blown, the ignition switch may be bad.

Check fuses under dash the following do not have power

10 A illum

10 A CRANK

10A INT PRK

REMOVED FUSES AND ALL HAVE OHM READINGS OF 0.3

Yes, the fuses are good but there's likely a problem with the ignition switch. Replace it and all of your problems may be solved.

The basic flow is positive battery terminal to under hood fuse box to ignition switch to under dash fuse box to many other circuits.

Kindly advise steps need to be taken to remove switch.

It will be some variation of this:

1. Disconnect negative battery cable.

2. Remove dashboard lower cover and knee bolster.

3. Disconnect 5-P connector from under dash fuse box and 7-P connector from main wiring harness.

4. Remove steering column covers.

5. Insert key and turn it to "0".

6. Remove two screws from switch and replace.

Remember, you are dealing with the switch, not the lock.

Verify on the fuses that didn't have power that they still don't have power, when the ignition switch is turned to Start. You may need a manual to tell you how to test them.