A gas barbeque grill ignition system consists of several replaceable parts. The module, the electrode wire and the electrode are the primary parts although sometimes the module will be split into a spark generator, a connection switch (button) and a power source (battery). The electrode is like the spark plug in your car, the part that mounts on or near the gas grill burner and sparks to light the grill. The electrode is usually the culprit when you cannot light your grill. The gas BBQ ignition module, or spark generator, is the part that creates the juice. Many older gas barbeque grills used a piezo electric module. These simple ignition modules would last forever. However, most gas grills today use a battery-powered module. Ignition modules with batteries can corrode from moisture but it is not as common as most of us assume and it can usually be cleaned off. An electrode wire connecting the ignition to the module delivers the spark to light your gas grill. You should be able to see the steel running through porcelain in the front of the firebox just above or beside the gas grill burner. The electrode will consist of the steel rod in porcelain that receive the current and another piece of steel to spark against as a ground. The power from the battery ends as a spark at the tip of this steel rod. If the gas is on, this arc should ignite your gas grill burner. If your gas grill will not ignite, there could be a few different reasons. Reset the check valve if you are using a propane tank. However, the most common problem we see is in the ignition system.