sorry for being so vague
LED Rocker switches use a built-in LED to provide a clear indication that the switch is turned on, and are usually used for switching 12 volts DC. Single pole, single throw, or SPST, switches normally have two connections, one for the power going to the switch, and the other for the power leaving the switch to power the load when the switch is turned on. LED Rocker switches also have a third connection, which is needed to provide a ground connection for the LED.
That being said
one spade should be grounded to neg side battery
one spade should be power from battery +
one spade should go to the device you want to power (which also should be grounded)
should work if spades are going to right device