Today armed with a good wiring diagram I believe that it is the GEM that is bad . I started the truck up with the number 15 fuse removed at it started and shut down as well. as soon as I put the number 15 fuse back in I had power at fuse number 30 the PCM relay is getting powered up from the GEM for no reason that I can tell.
I am going to order a new/rebuilt GEM and will report back.
thank you to all the helped out.

 

I've seen them for sale on ebay for not that much.

 

thank I bought a remanufactured one should have it by Thursday.

 

The fuse box diagram I looked up claims the PATS and stop lamp switch(logic) are tied to that fuse also. No idea WTH the (logic) means but I could see the PATS causing some problems if it decided it wasn't happy for whatever reason.

 

I replace the GEM today and three same problem fuse 30 is hot anytime I put the GEM power fuse in number 15 fuse 5 amps ant help would be grate.
thank you

 

Replacing the central junction box I still have power on c242b, L1 on the ignition switch has power on it all the time. So when I would power up the GEM with fuse it already had power at fuse 30.
It would be like having the switch in start all the time. I will report back after new/remanufactured central box is installed.

 

Maybe its the alternator. If a diode goes bad, it feeds power back through the system and causes a no turn off issue. Try unhooking the alternator and see if it turns off.

 

Solved OK new GEM mod was remanufactured and no good. it would not turn on the light or roll the windows I put the old one back on and found that the PATS mod was doing it the whole time it was feeding the L1 (on the ing switch ) with power .if I unplug the PATS the problem go's away.

 

Good job! You kept at it and the effort paid off.