What does a high level of resistance in the ignition coil often indicate?

A high level of resistance in the ignition coil typically indicates a faulty coil. Ignition coils function by converting battery voltage to a much higher voltage required to create a spark at the spark plugs. For this process to work efficiently, the coil must have a specific resistance level that allows current to flow correctly.

When the resistance is higher than normal, it signifies that there could be internal damage, such as an open winding or insulation breakdown, within the coil. This increase in resistance can lead to weak or no spark, which directly affects engine performance. Therefore, the presence of high resistance serves as a diagnostic marker for potential failure within the ignition coil itself, necessitating testing or replacement to restore proper functioning.

Normal operation would indicate a resistance level within the expected range, while a short circuit would typically reveal little to no resistance. A fully charged battery relates to the power supply context but does not directly correlate with the resistance measurements of the ignition coil.