January 06, 2025
If you’re experiencing issues with your Freightliner’s turn signal or high beam switch, and you already know that your bulbs aren’t burned out, replacing it yourself can save you time and money. This guide is designed for truck drivers, fleet owners, and DIY-ers who want a straightforward solution to fixing this common problem.
Before you begin, gather the following tools to make the job seamless:
Torx head bit (commonly T20, but confirm with your truck)
Replacement switch (OEM or aftermarket compatible)
If your high beams or turn signals are unresponsive, inspect the switch. Worn-out wiring or internal damage is often the culprit.
Tilt the steering wheel to create a workspace.
Gather your tools and replacement switch.
Locate the four screws securing the turn signal switch. Use a Torx head bit to remove them.
Disconnect the wiring harness by carefully unplugging it. If it’s difficult to remove, wiggle gently to avoid damage.
If your switch has been modified with external wiring (like a toggle switch), cut those wires for a clean removal.
Position the new switch into the mounting area. Align the bottom screws and tighten them securely.
Connect the wiring harness. Don’t worry—it only fits one way for foolproof installation.
Before reassembling the steering column, test the high beams, turn signals, and hazard lights to ensure the new switch is functioning correctly.
Carefully reattach the top and bottom column covers, ensuring no wires are pinched or exposed.
Disconnect the battery before starting to avoid accidental short circuits.
Avoid pinching or twisting the wires during reinstallation.
Tight Screws: If screws are difficult to remove, use a penetrating oil to loosen them.
Worn Wiring: Inspect wiring for brittleness, which can cause future malfunctions.
Misaligned Parts: Make sure the switch is seated properly to avoid installation issues.
Periodically check your turn signal switch for wear and tear.
Ensure wiring connections remain secure to prevent future problems.
Replacing your Freightliner turn signal switch at a shop can cost upwards of $140 an hour in labor alone. By following this guide, you can complete the task in about 15–30 minutes and save a significant amount of money.
Need a new turn signal switch or other replacement parts? FinditParts offers a wide selection of Freightliner-compatible switches, wires, and tools—both OEM and aftermarket. Shop now for competitive prices and fast shipping.
💡 Pro Tip: Watch DIYSEMI’s video for exclusive discounts on truck parts and tools to make your next repair even easier.
