Wireing ignition relay help

[Enrique Claure <spanlab@ceibo.entelnet.bo>]

Hi list, can somebody please tell me how to wire the ignition relay. I 
still have the original Lucas

  /    ---87
|        |--- 86
|    [_/_]
|       \__85
|
|_____30/51

available cables in my car and wire diagram are:  RW(RED WHITE), B(BLACK), 
WN(WHITE BROWN), N(BROWN)

Please let me know how these connect or how to read that diagram.

Thanks, Enrique