Standard Ignition RU-12 Ballast Resistor
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Standard Ignition

Standard Ignition RU-12 Ballast Resistor

Brand Standard Ignition RU-12
Cold Resistance 1.15-1.38 ohms
Connector Gender No Connector
Mounting Bracket(s) Included No
Operating Resistance 4.75-5.75 ohms At 25 Degrees C
Terminal Gender Male
Terminal Type 4 Blade Terminals
Fits Dodge, Plymouth, and Chrysler · 303 vehicles

Ceramic body. Helps dissipate heat for stable ignition performance.

Nichrome winding. Adds durability for extended service life.

OE-quality manufacturing. Built under complete quality control from component to finished part.

Cross-references Gates 22005, Karlyn 5212 and 2-3005 for the same application. See all 14.

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Ballast Resistor for Chrysler and Dodge Ignition Systems

Standard Ignition RU-12 is a ballast resistor built for primary ignition circuits that need controlled current and stable coil operation. It uses a heavy molded ceramic body for heat dissipation and a nichrome wire winding for durability in demanding underhood conditions.

Compatible With Chrysler, Dodge, and Plymouth applications including Dodge Dakota, Ram 1500, Ramcharger, and Chrysler New Yorker models that use a 4 blade terminal ballast resistor layout.

Key Features

  • Heavy molded ceramic body helps manage heat in the ignition circuit
  • Nichrome wire winding supports consistent resistance and long service life
  • Cold resistance: 1.15-1.38 ohms
  • Operating resistance: 4.75-5.75 ohms at 25 degrees C
  • 4 blade terminals with male terminal design
  • No connector and no mounting brackets included
  • Standard Ignition RU-12 for primary ignition service

Detailed Description

The Standard Ignition RU-12 ballast resistor is engineered for vehicles that rely on a resistor in the ignition primary circuit to regulate current flow to the coil. Its ceramic construction helps dissipate heat, while the nichrome winding is selected for durability and stable electrical performance. This part number, RU-12, is a direct-fit style replacement for many Chrysler, Dodge, and Plymouth trucks and cars from the 1970s through the 1990s, including Dodge D150, W150, Ramcharger, and Chrysler LeBaron applications with 4 blade terminals.

This part cross-references Gates 22005 for the same application.

What It Helps Address

  • Hard starting caused by a failing ballast resistor
  • Intermittent ignition performance from heat-damaged resistor elements
  • Engine stalling related to unstable coil voltage control
  • No-start conditions tied to an open or high-resistance resistor
  • Misfire concerns from inconsistent primary ignition current

Installation Notes and Tips

Verify the vehicle uses a 4 blade terminal ballast resistor before ordering. Match the terminal layout and resistance values to the original part, and inspect the connector condition before installation. Because this component operates in a heat-exposed area, confirm the mounting surface is clean and the surrounding wiring is in good condition. Standard Ignition RU-12 is listed for N/A position applications.

Quality Assurance

Standard Ignition has supplied ignition products to the automotive aftermarket since 1919 and maintains manufacturing quality control from component selection through finished product. As an original equipment ignition manufacturer, the brand applies controlled production standards to support consistent fit and electrical performance.

Related reading

This part fits 303 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersFuel TypePositionNotes
1994DodgeDakota———N/A4 Blade Term.
1994DodgeRam 15003.9LV6—N/A4 Blade Term.
1994DodgeRam 15005.2LV8—N/A4 Blade Term.
1994DodgeRam 15005.9LV8—N/A4 Blade Term.
1994DodgeRam 25005.2LV8—N/A4 Blade Term.
1994DodgeRam 25005.9LV8—N/A4 Blade Term.
1994DodgeRam 35005.9LV8—N/A4 Blade Term.
1993DodgeD1503.9LV6—N/A4 Blade Term.
1993DodgeD1505.2LV8—N/A4 Blade Term.
1993DodgeD1505.9LV8—N/A4 Blade Term.
1993DodgeD2503.9LV6—N/A4 Blade Term.
1993DodgeD2505.2LV8—N/A4 Blade Term.
1993DodgeD2505.9LV8—N/A4 Blade Term.
1993DodgeD3505.9LV8GASN/A4 Blade Term.
1993DodgeDakota———N/A4 Blade Term.
1993DodgeRamcharger5.9LV8—N/A4 Blade Term.
1993DodgeW1503.9LV6—N/A4 Blade Term.
1993DodgeW1505.2LV8—N/A4 Blade Term.
1993DodgeW1505.9LV8—N/A4 Blade Term.
1993DodgeW2505.2LV8—N/A4 Blade Term.
1993DodgeW2505.9LV8—N/A4 Blade Term.
1993DodgeW3505.9LV8—N/A4 Blade Term.
1992DodgeD1503.9LV6—N/A4 Blade Term.
1992DodgeD1505.2LV8—N/A4 Blade Term.
1992DodgeD2503.9LV6—N/A4 Blade Term.
1992DodgeD2505.2LV8—N/A4 Blade Term.
1992DodgeD2505.9LV8—N/A4 Blade Term.
1992DodgeD3505.9LV8GASN/A4 Blade Term.
1992DodgeDakota———N/A4 Blade Term.
1992DodgeRamcharger5.9LV8—N/A4 Blade Term.
1992DodgeW1503.9LV6—N/A4 Blade Term.
1992DodgeW1505.2LV8—N/A4 Blade Term.
1992DodgeW2505.2LV8—N/A4 Blade Term.
1992DodgeW2505.9LV8—N/A4 Blade Term.
1992DodgeW3505.9LV8—N/A4 Blade Term.
1991DodgeD1503.9LV6—N/A4 Blade Term.
1991DodgeD1505.2LV8—N/A4 Blade Term.
1991DodgeD1505.9LV8—N/A4 Blade Term.
1991DodgeD2503.9LV6—N/A4 Blade Term.
1991DodgeD2505.2LV8—N/A4 Blade Term.
1991DodgeD2505.9LV8—N/A4 Blade Term.
1991DodgeD3505.9LV8GASN/A4 Blade Term.
1991DodgeDakota———N/A4 Blade Term.
1991DodgeRamcharger5.2LV8—N/A4 Blade Term.
1991DodgeRamcharger5.9LV8—N/A4 Blade Term.
1991DodgeW1503.9LV6—N/A4 Blade Term.
1991DodgeW1505.2LV8—N/A4 Blade Term.
1991DodgeW1505.9LV8—N/A4 Blade Term.
1991DodgeW2505.2LV8—N/A4 Blade Term.
1991DodgeW2505.9LV8—N/A4 Blade Term.
1991DodgeW3505.9LV8—N/A4 Blade Term.
1990DodgeB150———N/A4 Blade Term.
1990DodgeB250———N/A4 Blade Term.
1990DodgeB350———N/A4 Blade Term.
1990DodgeD1503.9LV6—N/A4 Blade Term.
1990DodgeD1505.2LV8—N/A4 Blade Term.
1990DodgeD1505.9LV8—N/A4 Blade Term.
1990DodgeD2503.9LV6—N/A4 Blade Term.
1990DodgeD2505.2LV8—N/A4 Blade Term.
1990DodgeD2505.9LV8—N/A4 Blade Term.
1990DodgeD3505.9LV8GASN/A4 Blade Term.
1990DodgeDakota———N/A4 Blade Term.
1990DodgeRamcharger5.2LV8—N/A4 Blade Term.
1990DodgeRamcharger5.9LV8—N/A4 Blade Term.
1990DodgeW1503.9LV6—N/A4 Blade Term.
1990DodgeW1505.2LV8—N/A4 Blade Term.
1990DodgeW1505.9LV8—N/A4 Blade Term.
1990DodgeW2505.2LV8—N/A4 Blade Term.
1990DodgeW2505.9LV8—N/A4 Blade Term.
1990DodgeW3505.9LV8—N/A4 Blade Term.
1989DodgeB150———N/A4 Blade Term.
1989DodgeB250———N/A4 Blade Term.
1989DodgeB350———N/A4 Blade Term.
1989DodgeDakota———N/A4 Blade Term.
1988DodgeB150———N/A4 Blade Term.
1988DodgeB250———N/A4 Blade Term.
1988DodgeB350———N/A4 Blade Term.
1988DodgeD100———N/A—
1988DodgeD150———N/A—
1988DodgeD250———N/A—
1988DodgeD350———N/A—
1988DodgeDakota———N/A4 Blade Term.
1988DodgeRamcharger———N/A4 Blade Term.
1988DodgeW100———N/A—
1988DodgeW150———N/A—
1988DodgeW250———N/A—
1988DodgeW350———N/A—
1987DodgeB150———N/A4 Blade Term.
1987DodgeB250———N/A4 Blade Term.
1987DodgeB350———N/A4 Blade Term.
1987DodgeD100———N/A—
1987DodgeD150———N/A—
1987DodgeD250———N/A—
1987DodgeD350———N/A—
1987DodgeRamcharger———N/A4 Blade Term.
1987DodgeW100———N/A—
1987DodgeW150———N/A—
1987DodgeW250———N/A—
1987DodgeW350———N/A—
1986DodgeB150———N/A4 Blade Term.
1986DodgeB250———N/A4 Blade Term.
1986DodgeB350———N/A4 Blade Term.
1986DodgeD100———N/A—
1986DodgeD150———N/A—
1986DodgeD250———N/A—
1986DodgeD350———N/A—
1986DodgeRamcharger———N/A4 Blade Term.
1986DodgeW100———N/A—
1986DodgeW150———N/A—
1986DodgeW250———N/A—
1986DodgeW350———N/A—
1985DodgeB150———N/A4 Blade Term.
1985DodgeB250———N/A4 Blade Term.
1985DodgeB350———N/A4 Blade Term.
1985DodgeD150———N/A—
1985DodgeD250———N/A—
1985DodgeD350———N/A—
1985DodgeRamcharger———N/A4 Blade Term.
1985DodgeW150———N/A—
1985DodgeW250———N/A—
1985DodgeW350———N/A—
1984DodgeB150———N/A4 Blade Term.
1984DodgeB250———N/A4 Blade Term.
1984DodgeB350———N/A4 Blade Term.
1984DodgeD150———N/A4 Blade Term.
1984DodgeD250———N/A4 Blade Term.
1984DodgeD350———N/A4 Blade Term.
1984DodgeRamcharger———N/A4 Blade Term.
1984DodgeW150———N/A4 Blade Term.
1984DodgeW250———N/A4 Blade Term.
1984DodgeW350———N/A4 Blade Term.
1983DodgeB150———N/A4 Blade Term.
1983DodgeB250———N/A4 Blade Term.
1983DodgeB350———N/A4 Blade Term.
1983DodgeD150———N/A4 Blade Term.
1983DodgeD250———N/A4 Blade Term.
1983DodgeD350———N/A4 Blade Term.
1983DodgeRamcharger———N/A4 Blade Term.
1983DodgeW150———N/A4 Blade Term.
1983DodgeW250———N/A4 Blade Term.
1983DodgeW350———N/A4 Blade Term.
1983PlymouthPB150———N/A4 Blade Term.
1983PlymouthPB250———N/A4 Blade Term.
1983PlymouthPB350———N/A4 Blade Term.
1982DodgeB150———N/A4 Blade Term.
1982DodgeB250———N/A4 Blade Term.
1982DodgeB350———N/A4 Blade Term.
1982DodgeD150———N/A4 Blade Term.
1982DodgeD250———N/A4 Blade Term.
1982DodgeD350———N/A4 Blade Term.
1982DodgeRamcharger———N/A4 Blade Term.
1982DodgeW150———N/A4 Blade Term.
1982DodgeW250———N/A4 Blade Term.
1982DodgeW350———N/A4 Blade Term.
1982PlymouthPB150———N/A4 Blade Term.
1982PlymouthPB250———N/A4 Blade Term.
1982PlymouthPB350———N/A4 Blade Term.
1981DodgeB150———N/A4 Blade Term.
1981DodgeB250———N/A4 Blade Term.
1981DodgeB350———N/A4 Blade Term.
1981DodgeD150———N/A4 Blade Term.
1981DodgeD250———N/A4 Blade Term.
1981DodgeD350———N/A4 Blade Term.
1981DodgeRamcharger———N/A4 Blade Term.
1981DodgeW150———N/A4 Blade Term.
1981DodgeW250———N/A4 Blade Term.
1981DodgeW350———N/A4 Blade Term.
1981PlymouthPB150———N/A4 Blade Term.
1981PlymouthPB250———N/A4 Blade Term.
1981PlymouthPB350———N/A4 Blade Term.
1980ChryslerLeBaron———N/Aw/o Lean Burn; 4 Blade Term.
1980ChryslerNew Yorker———N/Aw/o Lean Burn; 4 Blade Term.
1980ChryslerNewport———N/Aw/o Lean Burn; 4 Blade Term.
1980ChryslerTown & Country———N/Aw/o Lean Burn; 4 Blade Term.
1980DodgeAspen———N/A4 Blade Term.
1980DodgeB100———N/A4 Blade Term.
1980DodgeB200———N/A4 Blade Term.
1980DodgeB300———N/A4 Blade Term.
1980DodgeChallenger———N/A4 Blade Term.
1980DodgeD150———N/A4 Blade Term.
1980DodgeD200———N/A4 Blade Term.
1980DodgeD300———N/A4 Blade Term.
1980DodgeRamcharger———N/A4 Blade Term.
1980DodgeW150———N/A4 Blade Term.
1980DodgeW200———N/A4 Blade Term.
1980DodgeW300———N/A4 Blade Term.
1979ChryslerLeBaron———N/Aw/o Lean Burn; 4 Blade Term.
1979ChryslerNew Yorker———N/Aw/o Lean Burn; 4 Blade Term.
1979ChryslerNewport———N/Aw/o Lean Burn; 4 Blade Term.
1979ChryslerTown & Country———N/Aw/o Lean Burn; 4 Blade Term.
1979DodgeAspen———N/A4 Blade Term.
1979DodgeB100———N/A4 Blade Term.
1979DodgeB200———N/A4 Blade Term.
1979DodgeB300———N/A4 Blade Term.
1979DodgeChallenger———N/A4 Blade Term.
1979DodgeD100———N/A4 Blade Term.
1979DodgeD150———N/A4 Blade Term.
1979DodgeD200———N/A4 Blade Term.
1979DodgeD300———N/A4 Blade Term.
1979DodgeD50———N/A—
1979DodgeMagnum———N/A—
1979DodgeRamcharger———N/A4 Blade Term.
1979DodgeW150———N/A4 Blade Term.
1979DodgeW200———N/A4 Blade Term.
1979DodgeW300———N/A4 Blade Term.
1978ChryslerLeBaron———N/Aw/o Lean Burn; 4 Blade Term.
1978ChryslerNew Yorker———N/Aw/o Lean Burn; 4 Blade Term.
1978ChryslerNewport———N/Aw/o Lean Burn; 4 Blade Term.
1978ChryslerTown & Country———N/Aw/o Lean Burn; 4 Blade Term.
1978DodgeAspen———N/A4 Blade Term.
1978DodgeB100———N/A4 Blade Term.
1978DodgeB200———N/A4 Blade Term.
1978DodgeB300———N/A4 Blade Term.
1978DodgeChallenger———N/A4 Blade Term.
1978DodgeCharger———N/A4 Blade Term.
1978DodgeD100———N/A4 Blade Term.
1978DodgeD150———N/A4 Blade Term.
1978DodgeD200———N/A4 Blade Term.
1978DodgeD300———N/A4 Blade Term.
1978DodgeMagnum———N/A—
1978DodgeMonaco———N/A4 Blade Term.
1978DodgeRamcharger———N/A4 Blade Term.
1978DodgeW150———N/A4 Blade Term.
1978DodgeW200———N/A4 Blade Term.
1978DodgeW300———N/A4 Blade Term.
1977ChryslerLeBaron———N/Aw/o Lean Burn; 4 Blade Term.
1977ChryslerNew Yorker———N/Aw/o Lean Burn; 4 Blade Term.
1977ChryslerNewport———N/Aw/o Lean Burn; 4 Blade Term.
1977ChryslerTown & Country———N/A—
1977DodgeAspen———N/A4 Blade Term.
1977DodgeB100———N/A4 Blade Term.
1977DodgeB200———N/A4 Blade Term.
1977DodgeB300———N/A4 Blade Term.
1977DodgeCharger———N/A4 Blade Term.
1977DodgeD100———N/A4 Blade Term.
1977DodgeD150———N/A4 Blade Term.
1977DodgeD200———N/A4 Blade Term.
1977DodgeD300———N/A4 Blade Term.
1977DodgeMonaco———N/A4 Blade Term.
1977DodgeRamcharger———N/A4 Blade Term.
1977DodgeW100———N/A4 Blade Term.
1977DodgeW150———N/A4 Blade Term.
1977DodgeW200———N/A4 Blade Term.
1977DodgeW300———N/A4 Blade Term.
1976ChryslerNew Yorker———N/Aw/o Lean Burn; 4 Blade Term.
1976ChryslerNewport———N/Aw/o Lean Burn; 4 Blade Term.
1976ChryslerTown & Country———N/A—
1976DodgeAspen———N/A4 Blade Term.
1976DodgeB100———N/A4 Blade Term.
1976DodgeB200———N/A4 Blade Term.
1976DodgeB300———N/A4 Blade Term.
1976DodgeCharger———N/A4 Blade Term.
1976DodgeD100———N/A4 Blade Term.
1976DodgeD200———N/A4 Blade Term.
1976DodgeD300———N/A4 Blade Term.
1976DodgeDart———N/A4 Blade Term.
1976DodgeMonaco———N/A4 Blade Term.
1976DodgeRamcharger———N/A4 Blade Term.
1976DodgeW100———N/A4 Blade Term.
1976DodgeW200———N/A4 Blade Term.
1976DodgeW300———N/A4 Blade Term.
1975ChryslerImperial———N/A4 Blade Term.
1975ChryslerNew Yorker———N/Aw/o Lean Burn; 4 Blade Term.
1975ChryslerNewport———N/Aw/o Lean Burn; 4 Blade Term.
1975ChryslerTown & Country———N/A—
1975DodgeCharger———N/A4 Blade Term.
1975DodgeColt———N/A—
1975DodgeD100———N/A4 Blade Term.
1975DodgeD200———N/A4 Blade Term.
1975DodgeD300———N/A4 Blade Term.
1975DodgeDart———N/A4 Blade Term.
1975DodgeMonaco———N/A4 Blade Term.
1975DodgeRamcharger———N/A4 Blade Term.
1975DodgeW100———N/A4 Blade Term.
1975DodgeW200———N/A4 Blade Term.
1975DodgeW300———N/A4 Blade Term.
1974ChryslerImperial———N/A4 Blade Term.
1974ChryslerNew Yorker———N/Aw/o Lean Burn; 4 Blade Term.
1974ChryslerNewport———N/Aw/o Lean Burn; 4 Blade Term.
1974ChryslerTown & Country———N/A—
1974DodgeChallenger———N/A—
1974DodgeCharger———N/A4 Blade Term.
1974DodgeColt———N/A—
1974DodgeDart———N/A4 Blade Term.
1974DodgeMonaco———N/A4 Blade Term.
1974DodgeRamcharger———N/A4 Blade Term.
1973ChryslerImperial———N/A4 Blade Term.
1973ChryslerNew Yorker———N/Aw/o Lean Burn; 4 Blade Term.
1973ChryslerNewport———N/Aw/o Lean Burn; 4 Blade Term.
1973ChryslerTown & Country———N/A—
1973DodgeCharger———N/A4 Blade Term.
1973DodgeColt———N/A—
1973DodgeDart———N/A4 Blade Term.
1973DodgeMonaco———N/A4 Blade Term.
1972ChryslerImperial———N/A4 Blade Term.
1972ChryslerNew Yorker———N/A4 Blade Term.
1972ChryslerNewport———N/A4 Blade Term.
1972ChryslerTown & Country———N/A4 Blade Term.
1972DodgeCharger———N/A4 Blade Term.
1972DodgeDart———N/A4 Blade Term.
1972DodgeMonaco———N/A4 Blade Term.
1971DodgeDart———N/A4 Blade Term.
1970DodgeDart———N/A4 Blade Term.
Directly replaces or cross-references 14 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Gates — 22005Karlyn — 52122-30052-52126R10088A450-5501365619912309764CR105FR57ICR24RUA1055RUE1