How to fix a 1996 Ford Ranger 6 cylinder that is stuck in park?

It won't get out of park when the vehicle is running.

Check your Brake Light. Check your Brake Fuse first. If it's still out it is most likely the Brake Switch and not the Bulbs. Because that also sends a signal to the Shift Interlock Solenoid that allows you to shift out of Park. But sometimes the Solenoid goes bad too.