While others have an electrode for each individual burner. Some grills will use one electrode to spark one burner and have carry over tubes to light the additional burners.
The spark generator will have one to eight outlets to plug in the electrode wires. Many grills today use a battery ignition system like Charbroil, TEC, Delta Heat, Weber, Nexgrill and more. If you do not hear the continual clicking from the spark module be sure to put in a new battery. The environmental elements can corrode the battery inside and damage the internal working of the spark igniter causing it to stop working. Unscrew the cap on the battery spark generator and check the battery. This type of ignition was used on older Weber, DCS and Viking grills. If you hear a constant clicking noise, your spark module is still working. The battery spark generator may contain switch (button) or it will have a plug that for a trigger switch. The spark generator comes in either a battery form or piezo. The main parts of a grill ignition will consist of a spark generator (module), electrodes, collector boxes (that hold the electrode in place) and wires. Breakdown of the Grill Ignition System (Piezo and Battery operated)
Just because the igniter is not working does not mean that it is actually broken. We get many calls from customers saying, "My grill will not light" or "My igniter is broken." Generally, the one of the first parts on a bbq to fail is the burner and not the ignition. Here at The BBQ Depot, we have repaired thousands of gas grills.