On a 5 pin automotive relay, the pins are numbered, 85, 86, 30, 87, and 87A

As near as I can tell, 85 is connected to the switched low current wire ) from inside the car), 86 is connected to ground (or through a switching device which goes to ground to complete the circuit, like a 2 terminal thermostatic fan switch in the engine water jacket), 30 is connected to the heavy (#10 ga.) wire from the battery, 87 is the terminal that carries the electricity from the relay through to the "device" being switched (fan, horn, etcetera) when the relay is energized. and 87A is the alternate terminal that carries the electrical current to a different device when the relay has no current fed into terminal #85. If you want to run the relay as a simple switch, you don't hook anything to terminal #87A. ---this is based on tests conducted in my garage.-----Brian