I can get the horn to work but the fan wiring is doing my head in

If i dont put it through a relay it works fine but ive tried the relay and no joy, I tried 2 new different relays to make sure it wasn't faulty,

Its a 4 point fused relay numbered 30, 85, 86 and 87

I have put live from battery to 30, blue fan wire3 to 87, 85 earth on battery and 86 to the switch, then i have earthed the black wire from the fan and the switch.

Does anyone have any idea what wires go to what numbers on the relay?

Cheers
Si