4x4 High/Low 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 high/low indication switch is a normally open switch that is case grounded. When 4X4 high is selected, the 4X4 high/low indication switch closes ground. When 4X4 low is selected, the 4X4 high/low indication switch closes to ground.