Normal Operation
WARNING: This page is about a different car, the 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The high beam indicator bulb receives voltage through circuit 12 (LG/BK) when the multifunction switch is placed in the high beam position. The high beam indicator bulb is grounded through the instrument cluster bulb ground circuit 57 (BK).