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most 30amp 12volt relays will look like this and be numbered the same. You should be able to pick these up at the local parts store as off-road or fog lighting relays. They run about 7 bucks there but i imagine an electroncs distributor would sell for much less.
if your relay looks like this then pole 86 goes to ground, pole 85 is the switch (goes to ignition or coil), pole 30 is the hot wire to the fans, pole 87(very top) is the hot wire from your battery. P.S. if you put your hot wire on 87a then your fans will be on when the switch is cold. You may also find it neccesary to put an additional manually operated switch on the relays switch to turn the fans off or on. This manually operated switch may also be accompanied by a temperature operated switch designed to turn on when the fans reach a certain temperature. My descriptions are confusing, i know, so if you have any questions feel free to ask.
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