Standard Ignition DS-991 Headlight Dimmer Switch

Headlight Dimmer Switch for Dodge B-Series

Restore reliable headlight beam control with this Standard Ignition headlight dimmer switch. Built with copper alloy conductors and tested for mechanical and electrical switching performance, it is made for service work where consistent operation matters.

Compatible with 1988-1990 Dodge B150, B250, and B350 models with a tilt steering wheel, this column-mounted switch is a direct-fit electrical replacement for the specified applications. Part number DS-991 is also referenced in interchange listings for related service applications.

Key Features

• Headlight dimmer switch for 12-volt systems
• Bolt-on attachment method for column mounting
• Female connector with 1 rectangular connector
• 4 male blade terminals
• Black, green, and silver finish with aluminum and plastic construction
• Copper alloy conductors for strong electrical conductivity and low resistive loss
• 100% tested for mechanical and electrical switching performance

Detailed Description

Standard Ignition DS-991 is a headlight dimmer switch engineered for dependable beam selection in older Dodge truck and van platforms. It is specified for column-mounted use and fits 1988-1989 Dodge B150, B250, and B350 models with a tilt steering wheel, as well as 1990 Dodge B150, B250, and B350 models with a tilt steering wheel. If you are servicing a Dodge B150, B250, or B350 and need a replacement dimmer switch for the steering column, DS-991 provides the correct electrical interface and mounting style for the listed vehicles.

This part cross-references Standard Motor Products DS165 and Dorman 1S1029 for the same application.

Common Problems This Part Can Address

• Headlights stuck on high beam or low beam
• Intermittent beam switching from the steering column
• Worn internal contacts causing inconsistent lighting response
• Electrical resistance that can affect switch performance
• Failure of the original column-mounted dimmer switch

Installation Notes and Tips

Install on the steering column using the bolt-on attachment method and verify the connector shape, terminal count, and terminal type before installation. Confirm the vehicle has a tilt steering wheel and matches the listed Dodge B-series fitment before replacing the switch. Check the lighting circuit for damage or corrosion if the original switch showed signs of heat or intermittent operation.

Quality Assurance

Standard Ignition states that this switch is built with robust materials and copper alloy conductors, and each unit is tested to verify both mechanical action and electrical switching performance.