When you check out sparky's,it gives you wire color,you can,with a dvom, check your 5v reference,when it shows low,you can disconnect each sensor mentioned,one by one to see if it's a bad sensor, voltage will come up,so key on for test of each, just don't plug any back in with key on,no spikes

 

Ok, thanks

 

I was going thru the sensors. Checking for 5 volts. And the FRP an APP had 2.21 volts. But after I unplugged EOP and I check the FRP and APP they had 5 volts. So do anyone thinks a bad EOP sensor would stop the truck from starting?