4x4 Mode Indication Switch
WARNING: This page is about a different car, the 2019 Ford F-550 Super Duty, 2019 Ford F-450 Super Duty, 2019 Ford F-350 Super Duty, and 2019 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
The 4x4 mode indication switch is a normally open switch that is case grounded. When 4X4 high is selected, the 4X4 mode indicator switch closes to ground. When 4X4 low is selected, the 4X4 mode indicator switch closes to ground.