The solenoid on your caddie's main switch allows all the voltage and amperage to make it to the generator. This unit is a vital part of making your golf cart run, but there is a whole list of items called the activation circuit. There are several microswitches located in various places that contribute to making the solenoid work. The forward and reverse has one, and so does the accelerator pedal. The most noticeable switch in the whole system is the Two Terminal Universal Key Switch. It's right up on the dash, and it's just as vital as the rest of them.Make sure that the rest of the switches in the circuit are functioning. The golf cart key switch is robust and usually does not fail unless there is a direct short. That would indicate at least one other unity and maybe your solenoid being faulty as well. Give Buggies Unlimited a call and ask for a tech to help you find the real problem.