The B&M neutral safety switch is a crucial component in many automatic transmission vehicles, ensuring the engine can only be started when the transmission is in Park or Neutral. This prevents accidental starts that could cause injury or damage. Correct wiring of the B&M neutral safety switch is paramount for it to function correctly. The wiring diagram (noun) is the key to successful installation and troubleshooting, as it details how the switch connects to the vehicle’s electrical system.