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The better write ups have the color of the wirings for both Altima fans and S chassis itself. For the second fan, you will have to use another method to activate it. The cheap way would be ignition power (fan turns on when car is on), or you can buy a fan controller.
To get the most out of the fan though, use 1 relay for each fan speed, 4 total. I have run 1, 2, 3, and 4 relays setups and 4 relays will have the fan running faster than the other options, and it is better for the wiring because the fans demand more power than what the relays offers when you running less that 4 of them.
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