Standard Ignition RU-37 Ballast Resistor

Ballast Resistor for Classic Chrysler, Dodge, and Jeep Ignition Systems

Standard Ignition RU-37 is a ballast resistor built for primary ignition circuits that need stable resistance and heat management. Its heavy molded ceramic body helps dissipate heat, while the nichrome wire winding supports durable, long-term operation in demanding underhood conditions.

Compatible with a wide range of Chrysler, Dodge, Plymouth, Honda, and Jeep applications, including Dodge D150, Dodge Ramcharger, and Jeep Wagoneer models that use a 2-terminal ballast resistor setup.

Key Features

• Heavy molded ceramic body for improved heat dissipation
• Nichrome wire winding for durability and extended service life
• Blade-style terminals with 2-terminal configuration
• Male terminal design with no connector required
• Mounting bracket(s) included for secure installation
• OE-style ignition service part for primary ignition circuits

Detailed Description

The Standard Ignition RU-37 ballast resistor regulates current in the ignition primary circuit to help maintain proper coil operation on vehicles that use a resistor-based ignition setup. It is a direct-fit service part for many older Dodge, Chrysler, Plymouth, Honda Civic, and Jeep applications, including models with Lean Burn, Electronic Spark Advance, Prestolite ignition, and 2-prong or 2-terminal configurations where specified in the fitment notes. This part cross-references Four Seasons 73070 for the same application.

Standard Ignition has supplied ignition components to the automotive aftermarket since 1919 and manufactures OE ignition products with quality control maintained through the production process. RU-37 is a practical replacement choice when servicing classic ignition systems that rely on a ballast resistor to manage coil current and heat.

Common Problems This Part Can Address

• Engine no-start conditions caused by a failed ballast resistor
• Intermittent ignition performance from heat-damaged resistor elements
• Weak spark related to incorrect primary circuit resistance
• Hard starting on vehicles with aging Lean Burn or electronic spark advance systems
• Ignition coil stress from an open or unstable resistor circuit

Installation Notes and Tips

• Verify terminal style, connector type, and mounting location before installation.
• Match the vehicle’s ignition system notes, including Lean Burn, Prestolite ignition, or 2-terminal fitment requirements.
• Inspect the coil, wiring, and connectors for heat damage before replacing the resistor.
• Confirm the replacement matches the original resistance application for the vehicle.

Quality Assurance

Standard Ignition manufactures ignition components with complete process control from component selection through finished product inspection. RU-37 is built with a ceramic housing and nichrome winding to support consistent electrical performance in primary ignition service.