How to find the right Automotive Replacement Ignition Ballast Resistors AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Automotive Replacement Ignition Ballast Resistors
- Correct resistance value
- Match the resistance specified for your coil and ignition system in the service manual Too little resistance overheats the coil and points, and too much weakens the spark.
- System type
- Use a ballast resistor only with coils and systems designed for one, such as points or some early electronic systems Many electronic conversions and high-output coils specify a full-voltage feed or their own resistor.
- Mounting and wiring
- Mount on a non-flammable surface with clean, tight terminals Ballast resistors run hot by design, and loose terminals cause intermittent stalling.
Brands that matter
- Standard Motor Products: Covers most classic domestic ballast resistor applications.
- Mopar: Classic Chrysler applications, where ballast resistors were common and failure-prone.
What to avoid
- Bypassing the ballast on a stock points coil
- Adding a ballast to a system whose electronic module needs full battery voltage
Questions
Why does my engine start but die as soon as I release the key?
A failed ballast resistor is a classic cause. The start position bypasses the resistor, so the engine fires during cranking but loses coil power in the run position.