As Luv2Go said check the position of you step switch, should be on, or your step will operate exactly as you describe.
I am assuming that when you say your step only operates with the engine running it does the following. Retracts as soon as you turn the key on, with the key on and/or the engine running the extends and retracts when you open and close the door. Once the key is turned off the first time you open the door the step extends and stays extended.
If the above is true, and the step switch is on, then it is probably a bad switch, or the less likely the wiring. Could also be the connector that is near the step under the coach. Step operators manual if you have it should have a detailed troubleshooting procedure.
Spike
Spike
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2020 Dutch Star - 3736 - L9 450HP, Freightliner
2008 Newmar VTDP - 3330 - ISBXT 350 Spartan NVS
FMCA F113720, NKK 18573
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