Keep voltage to the ignition coil in check with the Standard Ignition Ballast Resistor RW-34. It drops in as a direct-fit replacement across a huge span of Ford, Lincoln, and Mercury applications — including the 1966-1969 Ford Bronco, 1979-1990 Ford Mustang, 1975-1990 Ford Thunderbird, 1975-1982 Ford Granada, 1982-1990 Lincoln Town Car, and 1975-1990 Mercury Cougar. With 66 listed applications, see the Buyer's Guide tab for the full vehicle list.
Signs the ballast resistor may need replacing include an engine that fires while cranking but stalls the instant the key returns to the run position, hard starting, or intermittent stalling. If a failed ballast resistor is the cause, this replaces it — diagnose the circuit first, as those symptoms can have other causes.
Interchange: RU13 · IGNA66 · ICR22 · COLF12250A · 1972265. Manufacturer part number RW-34.
This part cross-references / interchanges with the following part numbers:
What does the RW-34 ballast resistor do?
It is wired in series with the ignition coil to limit current and reduce the voltage the coil sees during normal running, helping protect the coil and points.
Why does my engine start then die when I release the key?
On a ballast-resistor system, that can mean the resistor isn't passing voltage to the coil once cranking ends. If a failed ballast resistor is the cause, the RW-34 replaces it; diagnose the circuit first.
Will this fit my vehicle?
It's listed for 66 Ford, Lincoln, and Mercury applications, such as the 1979-1990 Ford Mustang and 1982-1990 Lincoln Town Car. Check the Buyer's Guide tab for the full list.
What numbers does the RW-34 interchange with?
It cross-references RU13, IGNA66, ICR22, COLF12250A, and 1972265. The manufacturer part number is RW-34.
Is the resistor bypassed during starting?
On a ballast-resistor ignition, the resistor is bypassed while cranking so the coil gets full voltage to start, then current routes through the resistor once the engine is running.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
