How do you know that you need an ignition switch or a ignition coil?

To determine if you need an ignition switch or an ignition coil, you can look for specific symptoms. If your vehicle doesn't start, but lights and accessories function normally, the ignition switch may be faulty. Conversely, if the engine cranks but doesn’t start, or if you experience misfires or stalling, the ignition coil could be the issue. Testing these components with a multimeter can provide further confirmation of their functionality.