OEX Ballast Resistor 1.82 Ohm OBR41

• Sourced from world leading OEM manufacturers
• Technology adapted for the aftermarket to provide a high level of quality and confidence.
• OEX range an extensive array of engine management and fuel system products
• All products covered by a 2 year / 40,000km warranty

A Ballast Resistor reduces voltage to the coil so that more energy is available for the spark plugs during starting. Traditionally, ignition systems didnt use a ballast, meaning that the ignition system used a 12v coil with a 12v feed from the battery via the ignition switch. This system is fine when the engine is running, however can be problematic when starting. Because the starter motor draws a huge amount of current from the battery, the spark plugs are left with less energy to create the spark. This is worsened in colder starting temperatures or when the starter motor is worn, when even more energy is drawn by the starter motor leaving even less available for the spark plugs. To counteract this distribution of energy, ignition systems were changed to use a 9v coil instead of a 12v coil. A 9v coil gives the same output as a 12v coil when provided with a 12v feed, resulting in a better spark for starting with less energy draw on the starter motor.