Yamaha Voltage Regulator (1978-1991) G1/G2/G9 Gas Golf Cart Regulates the amount of voltage your starter generator puts out to your battery. Our parts meet or exceed OEM quality standards. Make sure you have the correct model Yamaha. Please call for details. Fits the Following Cart(s): Yamaha (1978-1991) G1, G2, and G9 gas golf cart.