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It will probably have a permanent 12v on one side & the step switch will earth the other.You could connect 12v direct to the buzzer to check it's working.
Easy to check with a meter and if so ground the other side of the buzzer.It will probably have a permanent 12v on one side & the step switch will earth the other.
On my Hymer the step switch is outside the motor and very visible (and dirty!).
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