Jeffwazz
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On the Rx, there's sockets for Batt, Ch1, Ch2, Ch3. So just plug the fans into the Batt or Ch3 sockets.Really stupid question, but how do you power the fans? What do they plug into? Thanks!
The +ve and -ve are effectively common rails, it's only the signal lines which are separate.
The Rx gets power straight from the ESC in Ch2, and this will supply 6A continuous current at either 6v or 7,4v. (7,4v makes the steering quicker and more powerful, but check the max voltage of your particular servo - stock one takes up to 8,4v).
And from that available 6A, you're running the ESC fan, the Rx, steering servo, and any motor fans that you're plugging in. A long as the total current draw is less than 6A (it should be) it'll work just fine.