Your golf cart is only powered by one 12 volt battery. True, an engine helps somewhat, but the battery gets things started and runs all of the electrical systems on the caddie. Over time the voltage will begin to slip as the battery goes bad. As voltage drops, amperage starts to rise. When this happens, something else takes the elevator and amps to the top, which is heat. This is the biggest enemy of your coach. When things get hot, they melt. Anything electrical on the cart is at risk; the first thing to take any brunt of the temperature rise would be your Yamaha G22 and G29 12-Volt Solenoid. This unit has to get all of the power from the battery to the starter.This golf cart solenoid is a simple unit to understand. It is a switch that is electrically actuated. When you hit the pedal, it signals the small terminals that close an internal contact, connecting the battery to the starter. Call Buggies Unlimited and get one coming.