Several players in the process make your spark happen. We are talking about the components of the golf cart that ensures the spark plug does its thing. The plug is directly attached to the Yamaha TCI Unit for your G16. This is also known as the ignition coil. It takes the 12-13 volts from the battery and amplifies it into tens of thousands of volts. Your spark plug acts as a conductor for a lightning strike happening over and over again every second. These are high wear parts being that they do so much work at such high voltages. They are only good for so many hours of use, and when they start to give up the ghost, all kinds of crazy stuff can happen, from erratic spark to no spark at all.If you think replacing a golf cart TCI unit is a difficult job, you are underestimating yourself. They are not a walk in the park by any means, but this is something that you can do in your backyard with the help of Buggies Unlimited.