Headlight Dimmer Switch for 1979-1989 Dodge Diplomat & More - Standard Ignition DS-78

Change between low and high beams as needed with this Standard Ignition switch, the DS-78 Headlight Dimmer Switch, which selects between the headlamp low-beam and high-beam circuits. It is a direct-fit replacement for many vehicles, among them the 1979-1989 Dodge Diplomat, 1980-1983 Dodge Mirada and 1979-1981 Dodge St. Regis. See the Buyer's Guide tab for the full list.

• Quality control from start to finish: Standard Ignition, a global manufacturer of original equipment ignition products, keeps quality control in its own hands from componentry through to the finished product.
• Copper alloy conductors: Chosen for strong electrical conductivity with low resistive losses.
• 100% tested: Each part is checked to verify both its mechanical and electrical switching performance.
• Robust design: Built from high-grade materials to meet the demands of today's service professional, and backed by decades of research.

Signs a headlight dimmer switch may need replacing include high beams that won't come on, headlights that stay stuck on one beam setting, or lights that flicker or cut out when you change beams. Bulbs, wiring and connectors can cause the same symptoms, so diagnose the circuit before replacing the switch. If a worn dimmer switch is the cause, the DS-78 replaces it.

Interchange: DS123 · 3747515 · 4131337 · 4131373 · DS131 · 12321480