How do you know when your pick up coil is bad?

You can determine if your pickup coil is bad by checking for symptoms like difficulty starting the engine, intermittent stalling, or poor engine performance. Additionally, using a multimeter to measure the resistance of the coil can help; if the readings are outside the manufacturer’s specified range, the coil may be faulty. Lastly, if the ignition system is not producing a spark, the pickup coil could be the culprit.