Wiring it is a fairly simple job. You'll need 3 colors of wire to keep you straight. red/black for pos/neg(ground) and one other color for your realy activating wire.
A. Activating wire (Run to ignition switch or coil wire)
B. hot wire to fans (blue wire on maxima/altima fans)
G. ground/negative (connect the yellow wire on the maxima/altima fans to ground)
your relay should have a diagram like this on it or with it with these spots numbered and corresponding to poles on the relay
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