Bosch 000-158-17-45 Ballast Resistor 1.8 Ohm Red Bracket Ignition System

The Bosch 000-158-17-45 (0001581745) is a ballast resistor designed for use in classic ignition systems. Rated at 1.8 ohms and identified by its distinctive red mounting bracket, this resistor is engineered to regulate current flow to the ignition coil, protecting it from excessive voltage and extending coil service life — particularly important when using lower-impedance performance coils.

Ballast resistors reduce the voltage supplied to the ignition coil during normal engine operation. During engine cranking, the resistor is bypassed to allow full voltage to the coil, ensuring a strong spark for reliable starting. Once the engine is running, the resistor reintroduces resistance to limit heat buildup in the coil and maintain consistent ignition performance.

Key Features:

• Resistance: 1.8 ohms
• Bracket Color: Red (for easy identification among the resistor family)
• OEM-quality construction from Bosch, a global leader in ignition system components
• Direct replacement for original-equipment ballast resistors
• Protects the ignition coil by limiting current during normal engine operation

Cross-Reference Part Numbers: 0001581745, 000 158 17 45, 000.158.17.45, 000-158-17-45, Bosch 0-227-901-014, 0227901014, 0 227 901 014

Manufactured by Bosch to OEM specifications, this ballast resistor is a direct-fit replacement that restores proper ignition system function and coil protection.