The Neutral Safety Switch (NSS) on a 1994 Ford F-150 is located on the
transmission. More specifically, it's on the
top or side of the transmission case, near where the shift linkage connects. It's a relatively small switch, and its exact position can vary slightly depending on the specific transmission (manual or automatic) and the particular model of F-150.
You'll likely need to get underneath the truck to locate it. A repair manual for your specific year and model F-150 would give the most precise location and helpful diagrams. Be careful working under the vehicle and use jack stands for safety.
