Duralast SW1978 Turn Signal Switch
Specifications
- Compatibility:
- 1999-2005 Ford F-150
- 2004-2004 Ford F-150 Heritage
- 2000-2001 Ford F-250 Super Duty
- 2000-2005 Ford F-650
- 2000-2005 Ford F-750
- 2002-2003 Lincoln Blackwood
- Replaces OEM Part Numbers: SW1978, YL3Z13K359ABA,XL3Z13K359AAA, YL3T13K359ABW, YL3Z13K359AAA, 1S1850
Product Usage Instructions
Safety Precautions
- Disconnect the negative battery terminal to prevent electrical shorts or accidental airbag deployment.
- Work in a well-lit, ventilated area with proper tools.
- Wear safety glasses when working near wiring or sharp edges.
Tools Required
- Screwdriver
- Torx bit set (if applicable)
- Trim panel removal tool (optional)
- Wire stripper/crimper (if extending wires)
- Multimeter (for voltage checks)
Step-by-Step Installation Guide
- Reconnect the negative battery terminal.
- Test all functions:
- Left/Right turn signals (should blink steadily).
- Hazard lights (all four turn signals should flash).
- High-beam switch (if integrated).
Wiring Reference (If Needed)
- Orange wire – Fused +12V power source (if applicable).
- Black wire – Chassis ground (must have solid contact).
- Purple/Brown wires – Left/Right turn signal outputs.
Troubleshooting Tips
- No turn signals?
- Check fuses (typically in the cabin fuse box).
- Verify the flasher relay is functional.
- Ensure all wiring connections are secure.
- Fast-blinking signals?
- A bulb may be burnt out–inspect front/rear turn signal lamps.
Support & Warranty
If issues persist, contact us or refer to the Amazon product page for warranty assistance.
This manual ensures a safe and correct installation.
Always verify compatibility with your year, make, model and OEM part number before proceeding.
Compatibility
- Compatible with 1999-2005 Ford F-150
- Compatible with 2004-2004 Ford F-150 Heritage
- Compatible with 2000-2001 Ford F-250 Super Duty
- Compatible with 2000-2005 Ford F-650
- Compatible with 2000-2005 Ford F-750
- Compatible with 2002-2003 Lincoln Blackwood
Replaces OEM Part Numbers
SW1978, YL3Z13K359ABA, XL3Z13K359AAA,YL3T13K359ABW, YL3Z13K359AAA, 1S1850
Safety Precautions
Before starting, ensure:
- Disconnect the negative battery terminal to prevent electrical shorts or accidental airbag deployment.
- Work in a well-lit, ventilated area with proper tools.
- Wear safety glasses when working near wiring or sharp edges.
Tools Required
- Screwdriver
- Torx bit set (if applicable)
- Trim panel removal tool (optional)
Wire stripper/crimper (if extending wires)
- Multimeter (for voltage checks)
Step-by-Step Installation Guide
- Remove the Steering Column Covers
- Locate and remove screws securing the upper and lower steering column shrouds.
- Gently pry apart the plastic covers using a trim tool to avoid damage.
- Access the Old Turn Signal Switch
- Locate the turn signal switch assembly mounted near the steering column.
- Disconnect the wiring harness by pressing the locking tab and pulling it free.
- Remove any securing screws or clips holding the switch in place.
- Install the New Turn Signal Switch
- Align the new switch with the mounting points on the steering column.
- Secure it with the original screws or clips.
- Reconnect the wiring harness (ensure a firm click).
- Reassemble the Steering Column
- Reattach the upper and lower column covers, ensuring all clips snap into place.
- Tighten screws securely but avoid overtightening.
- Reconnect the Battery & Test
- Reconnect the negative battery terminal.
- Test all functions:
- Left/Right turn signals (should blink steadily).
- Hazard lights (all four turn signals should flash).
- High-beam switch (if integrated).
Wiring Reference (If Needed)
If your vehicle requires custom wiring:
- Orange wire → Fused +12V power source (if applicable).
- Black wire → Chassis ground (must have solid contact).
- Purple/Brown wires → Left/Right turn signal outputs.
Troubleshooting Tips
❌ No turn signals?
- Check fuses (typically in the cabin fuse box).
- Verify the flasher relay is functional.
- Ensure all wiring connections are secure.
❌ Fast-blinking signals?
- A bulb may be burnt out—inspect front/rear turn signal lamps.
Support & Warranty
If issues persist, contact us or refer to the Amazon product page for warranty assistance.
Frequently Asked Questions
Q: How do I know if this turn signal switch is compatible with my vehicle?
A: Verify compatibility with your year, make, model, and OEM part number before proceeding with the installation. Refer to the list of compatible vehicles in the manual.
Q: What should I do if my turn signals are not working after installation?
A: Check the fuses in the cabin fuse box, verify the flasher relay is functional, and ensure all wiring connections are secure.
If issues persist, contact customer support for further assistance.
Documents / Resources
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Duralast SW1978 Turn Signal Switch [pdf] Instruction Manual SW1978, YL3Z13K359ABA, XL3Z13K359AAA, YL3T13K359ABW, YL3Z13K359AAA, 1S1850, SW1978 Turn Signal Switch, Turn Signal Switch, Signal Switch, Switch |