Wiring Diagram for '96 Bronco Mirrors
ERROR: circuits 540 & 543 should indicate 12V (L), 0V (R)

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Signal mirrors display a supplemental turn signal through the outside rearview mirror glass surface. The signal is directed toward vehicles in adjacent traffic lanes and is not visible to the driver of the equipped vehicle.

The signal mirrors are equipped with an integrated light sensor and automatically adjust the brightness of the signal display for day and night operation. The signal is connected directly to the turn signal wiring.

WPT-382 (natural) shown; WPT-311 (natural) or WPT-174/712 (black) mate
Non-signal mirrors are similar, but with a 4-position connector using 3 pins.

The original signals were very complex to make them dim automatically, and only visible from outside; but since dimming doesn't really benefit anyone, these inexpensive signals can be added and mechanically directed away from the occupants. The rest of this photo album shows how, and how to add heat.

Owner caption September 2007 · Photo 1988 of 5000