To test your ignition switch you have to do some processes such as:  1. First, turn on the ignition switch to the "Off" position  2. Keep the probe at the back of the power feed wire of the module with the help of a multimeter.  3. Then put the negative lead into the ground base  4. After that, switch on the ignition key to the "Run" position 5. Finally, gauge the voltage with the help of a multimeter