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 LH turn indicator bulb receives voltage through circuit 3 (LG/WH) when the multifunction switch is placed in the LH turn signal position. The LH turn indicator bulb is grounded through the instrument cluster ground circuit 57 (BK).