Where is the inertia cutoff switch on Chevy 1500 PU Located?

There's no "inertia cutoff switch" in the traditional sense on a Chevy Silverado 1500 (or most modern vehicles). Older vehicles might have had such a switch to cut fuel in a collision, but modern vehicles use more sophisticated crash sensors and electronic systems to manage fuel shut-off and other safety features. These systems are integrated into the vehicle's computer and aren't accessible as a separate switch.