Ford E-350 Econoline Turn Signal Switch Guide (1975-1979)
Solve your classic Econoline's blinking and flashing electrical issues by starting at the source.
- A bad turn signal switch causes strange electrical issues, but always check fuses, bulbs, and grounds first.
- Replacement is a DIY-friendly job but absolutely requires a steering wheel puller.
- The correct part depends on your transmission (Auto/Manual) and if you have a tilt steering column; verify this before ordering.
- Standard Motor Products (SMP) is a widely trusted aftermarket brand for this component.
Is Your Turn Signal Switch Failing?
A bad turn signal switch in these vans can cause confusing problems. The symptoms aren't always straightforward. Before you assume the worst, always check your fuses, flasher relays, and light bulbs first. It's also critical to check your vehicle's electrical grounds, as bad grounds cause many strange lighting issues on older vehicles.
Common Symptoms of a Bad Switch:
- Signals Don't Work: The most obvious sign is turn signals that don't flash at all, on one or both sides.
- Intermittent Operation: The signals work sometimes and not others. This can be caused by a crack in the switch's hazard light mechanism.
- Signals Won't Cancel: The switch fails to 'click' back to the neutral position after you complete a turn.
- Strange Behavior with Headlights: A very common issue where the turn signals work fine until you turn on the headlights. Then, they might stay on solid, flash erratically, or cause the dash indicator to glow steadily.
- Dash Indicators Act Up: The turn signal indicator on your dashboard might glow faintly even when the signals are off.
Choosing the Right Aftermarket Switch
Original Ford (OEM) switches for this E-350 have been discontinued for years. Your only options for a new part are from the aftermarket. Quality can vary, so it's helpful to know the brands.
Brand Tiers
- Tier 1: Trusted Aftermarket (Standard Ignition): Standard Motor Products (SMP) is a well-known and respected brand in the aftermarket. Technicians and experienced DIYers often choose SMP for its reputation of good quality and fit, considering it close to the original factory part. For a critical part you don't want to replace twice, this is a reliable choice.
- Tier 2: Standard Replacement (Rostra): Rostra is an aftermarket manufacturer that produces a wide range of automotive parts. While they offer a switch for this application, there is less community feedback and history available compared to Standard Ignition for this specific component. These parts meet the basic requirements for fit and function.
Typical Replacement Costs
The cost to replace the turn signal switch depends on whether you do it yourself or use a repair shop. A special tool is required, which can impact your decision.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Switch | $91.03 - $198.33 |
| Shop Labor | $150 - $375 |
| Total Professional Replacement | $241.03 - $573.33 |
Frequently Asked Questions (FAQ)
Do I really need a special tool to replace the switch?
Yes. You cannot do this job without a steering wheel puller. The steering wheel must be removed to access the switch. Attempting to pry or hammer the wheel off will damage the steering column. Pullers are inexpensive and can often be rented from auto parts stores.
Why do my turn signals only mess up when the headlights are on?
This classic symptom is often caused by a bad ground somewhere in the lighting circuit, a corroded bulb socket, or a fault within the turn signal switch itself. When you turn on the headlights, the system draws more power and a weak ground can't handle it, causing voltage to feed back where it shouldn't. While a new switch can sometimes fix this, it's wise to check your grounds first.
Is it hard to run the new wires down the steering column?
This is often the trickiest part of the job. The new switch has a long wiring harness that must be fed down through the steering column. A common pro tip is to securely tape the new wires to the end of the old wires before you pull the old harness out from the bottom. This helps guide the new harness through the column.
Does this switch also control the horn or wipers?
For this generation of Ford van, the turn signal switch primarily handles the turn signals and hazard lights. The horn is typically operated by the horn pad itself, and the wipers are usually controlled by a separate switch on the dashboard.
Technical Specifications
OEM Part Numbers: D3TZ-13341-A D8TZ-13341-C
Multi-function switch for turn signals and hazard lights. Mounts inside the steering column. Harness connector is located at the base of the column. Different part numbers exist for Manual vs. Automatic transmission and Tilt vs. Non-Tilt steering columns.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.