Standard Ignition SR-121 Starter Relay

Starter Relay for Chrysler and Dodge Applications

The Standard Ignition SR-121 starter relay is built for direct replacement use in a wide range of Chrysler, Dodge, and Plymouth vehicles from the late 1980s through the mid-1990s. It features a 4-blade terminal design, a rectangular female connector, and a mounting bracket for secure under-hood installation.

With a 20 amp amperage rating and durable composite housing, this relay is made to handle heat, vibration, and other harsh engine-bay conditions. The SR-121 is a practical choice for restoring starter circuit operation on vehicles such as the Dodge Dakota, Dodge Ram 2500, and Chrysler LeBaron.

Key Features

• Starter relay for electrical, charging, and starting systems
• 20 amp amperage rating
• Female rectangular connector with 1 connector interface
• 4 male blade terminals for OE-style fitment
• Mounting bracket included for secure installation
• Composite housing helps protect against high under-hood temperatures
• Brass or copper contacts used where specified for wear resistance
• Manufactured under TS16949 and ISO9001 quality systems

Detailed Description

Standard Ignition SR-121 is a starter relay engineered for vehicles that use a 4-blade terminal layout and a rectangular connector. It is listed for many Chrysler, Dodge, and Plymouth models, including 1988-1990 Dodge Dakota, 1994-1996 Dodge Ram 2500, 1988-1989 Chrysler LeBaron, and 1988-1990 Plymouth Voyager. This part number, SR-121, is also a useful reference when searching for OE-style starter relay replacement options for older Mopar platforms.

The relay is built with a composite housing to help withstand severe under-hood conditions, while specified brass or copper contacts support long service life. Standard Ignition controls manufacturing from component selection through final assembly, and the part is produced to stringent quality requirements for consistent electrical performance.

This part cross-references Bosch 16123 for the same application.

What It Helps Fix

• No-crank condition when the starter circuit relay is failing
• Intermittent starter engagement on Chrysler, Dodge, and Plymouth vehicles
• Starter relay clicking without reliable starter activation
• Electrical starting issues caused by worn relay contacts
• Heat-related relay failure in the engine compartment

Installation Notes and Tips

Verify connector style, terminal count, and mounting location before installation. The SR-121 uses a female rectangular connector with 4 male blade terminals, so it should be matched to the vehicle’s original relay configuration. Confirm fitment for the exact year, make, and model, especially on Dodge Ram 50 applications that note a 4-blade terminal requirement.

For fitment examples, this relay fits 1988-1990 Dodge Dakota, 1994-1996 Dodge Ram 2500, and 1988-1989 Chrysler LeBaron. It also fits 1988-1990 Plymouth Voyager and 1989-1990 Dodge Caravan. Clean terminals and a secure bracket mount help support stable electrical contact.

Quality Assurance

Standard Ignition manufactures this relay under TS16949 and ISO9001 certified processes, with quality control maintained throughout production. The SR-121 is built to meet stringent part standards for the listed vehicle applications.