OK man,I just looked up the wiring schematic for your truck.
The start wire coming off the ign. switch is yellow,it goes to the clutch switch and comes off the clutch switch as purple. It goes through the bulkhead connector and into the main engine harness and down to the starter. At the starter it's purple. Dig into that main harness and find that purple wire coming from the left side of the truck. There is also a purple wire for the O2 sensor,it comes in from the right under the A/C accumulator,don't mess with that one!!!