Standard Ignition DS-151 Headlight Switch

Headlight Switch for Hidden Headlight Applications

The Standard Ignition DS-151 headlight switch is built for select Ford, Mercury, and Lincoln vehicles with hidden headlight systems. It uses copper alloy conductors for strong electrical conductivity and low resistive loss, with 100% testing for mechanical and electrical switching performance.

For restorations and repairs on classic Ford Thunderbird, Mercury Cougar, and Lincoln Continental models, this DS-151 headlight switch provides a direct replacement solution for the headlight circuit.

Key Features

• Direct, snap-fit attachment method
• 12-volt headlight switch design
• Female rectangular connector
• 8 blade terminals with male terminal ends
• Black, silver, and white housing materials and finishes
• Copper alloy conductors for low-resistance electrical flow
• 100% tested for switching performance

Detailed Description

Standard Ignition DS-151 is a headlight switch engineered for service work on vehicles equipped with hidden headlights. The switch is constructed with durable materials and copper alloy conductors to maintain consistent electrical contact in the headlight circuit. It is a direct-fit replacement for applications such as the Ford Thunderbird, Mercury Cougar, and Lincoln Continental, and it also serves select Ford LTD, Mercury Marquis, Mercury Colony Park, Mercury Montego, and Mercury Marauder models with hidden headlight systems. This part cross-references Standard Ignition DS-151 with OE-style replacement numbers such as 1S1504 and HL6625 for the same application.

Common Problems This Part Can Address

• Headlights that do not switch on or off correctly
• Intermittent headlight operation
• Worn internal switch contacts
• Electrical resistance in the headlight circuit
• Failure in hidden headlight control operation

Installation Notes and Tips

• Verify connector style, terminal count, and voltage before installation.
• Confirm the vehicle uses a hidden headlight setup where noted in fitment.
• Inspect the harness and terminals for heat damage or corrosion before connecting the new switch.
• Match the original switch mounting and snap-fit design to ensure proper seating.
• Test headlight function after installation to confirm correct switching.

Quality Assurance

Standard Ignition builds this switch with service-grade materials and validates both mechanical action and electrical performance through testing. The DS-151 is engineered to meet the demands of professional repair work on classic headlight systems.

Compatible Vehicles

• Fits 1975-1979 Lincoln Continental, N/A
• Fits 1975-1978 Ford LTD, N/A, w/ Hidden Headlight
• Fits 1968-1970 Ford LTD, N/A, w/ Hidden Headlight
• Fits 1977-1978 Mercury Marquis, N/A, w/ Hidden Headlight
• Fits 1970-1975 Mercury Marquis, N/A, w/ Hidden Headlight
• Fits 1968-1976 Ford Thunderbird, N/A, w/ Hidden Headlight
• Fits 1974 Mercury Colony Park, N/A
• Fits 1971-1973 Mercury Colony Park, N/A, w/ Hidden Headlight
• Fits 1969 Mercury Colony Park, N/A, w/ Hidden Headlight
• Fits 1965-1966 Mercury Colony Park, N/A, w/ Hidden Headlight
• Fits 1970-1971 Mercury Montego, N/A, w/ Hidden Headlight
• Fits 1968-1970 Mercury Cougar, N/A
• Fits 1969 Mercury Marauder, N/A