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Standard Ignition DS-1678 Headlight Dimmer Switch
| Brand | Standard Ignition DS-1678 |
|---|---|
| Attachment Method | Bolt On |
| Connector Gender | Female; Female |
| Connector Shape | Rectangular |
| Contents | Switch |
| Cruise Control Cancel Included | No |
| Cruise Control On/Off Operator Inc | No |
| Cruise Control Resume Included | No |
| Cruise Control Set Included | No |
| Cruise Control Speed Adjustment In | No |
| Displayed | Yes |
| Fog Light Operator Included | No |
| Functions | Combination Switch |
| Indicator Markings Included | Yes |
| Latching High Beam Operator Includ | Yes |
| Main Light Operator Included | No |
| Momentary High Beam Flasher Includ | Yes |
| New or Reman | New |
| Number Of Connector Cavities | 2 |
| Number Of Wiper Delay Settings | 7 |
| Number Of Wiper Speed Settings | 3 |
| Rear Window Washer Spray Included | Yes |
| Rear Window Wiper Delay Control In | Yes |
| Rear Window Wiper Speed Setting In | Yes |
| Running Light Operator Included | No |
| Terminal Gender | Male; Male |
| Terminal Type | Blade |
| Turn Signal Control Included | Yes |
| Turn Signal/Directional Indicator | Yes |
| Voltage | 12 |
| Windshield Washer Spray Included | Yes |
| Windshield Wiper Delay Setting Inc | Yes |
| Windshield Wiper Speed Setting Inc | Yes |
| Fits | Ford and Lincoln · 3 vehicles |
Bolt-on installation. Directly replaces the switch with no modifications needed.
Copper alloy conductors. Deliver strong conductivity with low resistive losses.
Combination switch. Controls wipers, washers, turn signals, and high beams.
Cross-references 1S1084, 53-16404 and 19145827 for the same application. See all 10.
Headlight Dimmer Switch for Ford and Lincoln
Restore reliable lighting control with this Standard Ignition headlight dimmer switch, part number DS-1678. It is built for 1997-1998 Ford Expedition and 1998 Lincoln Navigator applications, with combination-switch functionality for turn signals, windshield wipers, washer spray, and high-beam control.
Key Features
- Standard Ignition DS-1678 headlight dimmer switch
- Fits 1997-1998 Ford Expedition and 1998 Lincoln Navigator
- Bolt-on attachment method for direct replacement
- Female/female connector design with 2 rectangular connectors
- 12-volt electrical system application
- Combination switch functions with turn signal control included
- Latching high beam operator and momentary high beam flasher included
- Windshield washer spray, windshield wiper delay, and windshield wiper speed functions included
- Rear window washer spray, rear window wiper delay, and rear window wiper speed functions included
- 7 windshield wiper delay settings and 3 windshield wiper speed settings
- 15 blade terminals with male/male terminal gender
- New switch with indicator markings included
Detailed Description
Standard Ignition DS-1678 is a replacement headlight dimmer switch engineered for service work on the Ford Expedition and Lincoln Navigator. It uses copper alloy conductors for strong electrical conductivity and low resistive loss, and each unit is tested for both mechanical and electrical switching performance before release. This part cross-references Standard Motor Products (e.g., DS168, DS178) for the same application.
For 1997-1998 Ford Expedition and 1998 Lincoln Navigator vehicles, this combination switch supports lighting and wiper-related driver controls in one assembly. The design includes turn signal operation, high-beam latch and flash functions, windshield washer spray, windshield wiper delay and speed control, plus rear window washer and wiper controls where equipped. Standard Ignition DS-1678 is a direct-fit service part for technicians replacing a worn or malfunctioning switch.
Common Problems This Part Can Address
- Intermittent or non-working high beams
- Turn signal operation that fails or becomes inconsistent
- Wiper delay settings that stop responding
- Washer spray controls that do not activate
- Rear wiper or rear washer control issues
Installation Notes and Tips
Verify connector style, terminal count, and vehicle application before installation. This switch uses a bolt-on attachment method and rectangular female connectors, so matching the original harness and mounting points is important for proper fitment. Confirm the vehicle is a 1997-1998 Ford Expedition or 1998 Lincoln Navigator before ordering DS-1678.
Quality Assurance
Standard Ignition builds this switch with durable materials and conducts 100% testing to verify switching performance. The design reflects long-term development focused on technician requirements and dependable electrical operation.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 1998 | Ford | Expedition | N/A | — |
| 1998 | Lincoln | Navigator | N/A | — |
| 1997 | Ford | Expedition | N/A | — |
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