Mx, socal:

The circuit drawn by Mx is functionally correct; in most circuits 30 & 87 would be interchanged, so that 30 is connected to the power source, and 87 to the load.
If 30 & 87 are switched on Mx's drawing, it will be conventional.

So:
30 & 85 to 12V+
87 to fan motor
86 to switch

Caution: 87a should not be grounded. It is connected to 30 when the relay is de-energized, and hence is hot.