If it works when turning the wheel, now try putting your steering servo into channel 2 of your receiver. Does it turn as you pull the trigger? If not, then something's wrong with the transmitter or the receiver's 2nd channel.
If that works, then there should be no reason you couldn't swap them back (Servo Ch. 1, ESC Ch. 2) and have them work. Check that the wiring is in the right order in the connectors (black/red/signal), as I've sometimes mixed them up as well when reassembling them.
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