Early Bronco Turn Signal Switch

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Replacing Early Bronco Steering Column Wiring? The Turn Signal Switch Is the Key

If you are looking to replace your Early Bronco steering column wiring harness, the turn signal switch is how you do it. On the 1966-77 Ford Bronco, several key electrical circuits run directly through the turn signal switch inside the steering column. Because of this design, the Early Bronco turn signal switch serves as the primary steering column wiring harness, carrying multiple circuits through the column to the vehicle wiring under the dash.

The Early Bronco turn signal switch routes power through the steering column to control the turn signals, brake lights, horn, and dash indicators. On later Broncos, it also incorporates the hazard switch. When the switch wears out or the wiring becomes brittle over time, it can cause multiple electrical issues that seem unrelated at first. This is why problems with brake lights, turn signals, hazards, or the horn are often traced back to the steering column wiring contained within the turn signal switch.

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Circuits Controlled by the Early Bronco Turn Signal Switch

Because the Early Bronco steering column wiring harness is integrated into the switch, several circuits are managed through this single component. The circuits vary slightly between early and late Bronco models as the column design evolved.

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1966-73 Ford Bronco Turn Signal Switch Wiring

The 1966-73 Bronco turn signal switch controls the following circuits:

• Left and Right Turn Signals - Works in tandem with the turn signal flasher under the dash to control both the front and rear turn signal lights.

• Brake Lights - In this setup, brake light power runs through the turn signal switch. The switch then directs that power to both rear brake lights, or interrupts one side when a turn signal is activated so the signal can flash while the opposite brake light stays solid.

• Horn Circuit - In a 1966-73 Bronco, there is no horn relay. The turn signal switch has wiring to activate the horn when the horn button is activated.

Hazard Switch Note – On a 1966-73 Ford Bronco, the hazard switch is mounted on the dash and operates independently of the turn signal lever. The hazard system uses its own flasher separate from the turn signal flasher, allowing all four turn signal lights to flash at the same time.

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1974-77 Ford Bronco Turn Signal Switch Wiring

The 1974-77 Bronco steering column wiring functions similarly but uses an updated column connector and incorporates additional circuits tied to the later column design. This turn signal switch controls:

• Left and Right Turn Signals - Works in tandem with the turn signal flasher under the dash to control both the front and rear turn signal lights.

• Brake Lights - Works with the brake light switch on the pedal to activate the brake lights when the pedal is pressed.

• Horn Circuit - In a 1974-77 Bronco, there is a horn relay. The turn signal switch has wiring to activate the horn relay when the horn button is activated which in turn activates the horn.

• Hazard Switch - The emergency flasher switch is integrated into the turn signal switch on a 1974-77 Ford Bronco and operated by the pull knob on the steering column.

• PRNDL Indicator Light - For automatic transmission steering columns, there is integrated wiring in the turn signal switch to manage the gear shift indicator light.

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Since the Early Bronco turn signal switch doubles as the primary steering column wiring harness, replacing it often resolves several electrical problems at once. If you are experiencing issues with turn signals, brake lights, hazards, or the horn on your 1966-77 Ford Bronco, inspecting the Early Bronco steering column wiring through the turn signal switch is often one of the first and most effective steps in diagnosing the problem.

Check out our quick reference chart for identifying factory wiring in your Early Bronco Turn Signal Switch.

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