There are two relays in the engine compartment of my "72" 240Z that I am not sure what their function is. One relay is up front on the drivers side near the radiator, and the other is on the fire wall above the starter.

Both Relays (at least they look like relays) have 6 wires.
The front relay by the radiator and air pump has 1B, 3BY, and 2G.
The relay above the starter on the fire wall has 1BR, 2RB, 1RW, 1G and 1RY