What is the expected resistance for a secondary ignition coil?

The expected resistance for a secondary ignition coil is typically around 10K ohms, with a tolerance range that can go up to 2K ohms. This means that a healthy ignition coil's resistance should be within the range of approximately 8K to 12K ohms, which aligns with the choice of 10K +/- 2K ohms.

The secondary ignition coil is essential for creating the high voltage needed to produce the spark that ignites the air-fuel mixture in the engine's combustion chamber. If the resistance is too high or too low, it may indicate a fault within the coil, which can lead to poor engine performance, misfires, or starting issues. Therefore, having a baseline measurement of 10K ohms provides a useful framework for diagnostics and helps technicians identify when a coil may need to be replaced or serviced.

Other resistance values mentioned do not represent the expected range for secondary ignition coils in conventional automotive applications, as they deviate from common manufacturer specifications.