1997 Chevrolet Truck starting

An anti-theft system will prevent the engine from running, and they're pretty effective at preventing owners from driving their own vehicles, but they aren't involved in the starter circuit. How do you know the clutch switch and starter relay are okay?

Check for voltage on the two test points on fuse number 8 on the side of the dash. That's a 10 amp fuse. You must find 12 volts there when the ignition switch is in the "crank" position.