first thing i would check besides battery voltage, would be cables, especially if you ride in the salt. use small jumper cables and go from the negative side of the batt to a good ground on the motor, if the motor turns over, you found your problem. you can also do this with the positive side too, if your careful. make sure to hook the battery side of the cable up last and make sure its not touching anything else. also to check your relay you can take the orange wire from the relay and touch it to the battery side of the relay, if the motor turns over or you can hear the relay click, the relay is good and your problem is somewhere else.