My ranger has been on fire by unfashionable fuse box I have replaced every part of the dash. Still using the key that goes to the truck when I try to start by key the dash lights and fuel pump turns on but won't turn motor over will start of the cylenoid fine .. any ideas would be helpful thank you

 

Welcome to FTE.
Check/swap out the Start relay for a like one not needed to run the engine & let us know how it goes.
If the relay checks out ok, put the ignition switch on the suspect list.
What caused the fire?.