A large round baler includes mechanism for optionally wrapping a bale with either twine or a surface wrap material. A wrap control mechanism includes means whereby the wrapping process is initiated in response to a bale reaching a desired diameter within the bale chamber. Various microswitches are strategically mounted so as to be operated by various components of the twine and surface wrap mechanisms and the control mechanism therefor. These switches are integrated into an indicator circuit including indicator devices including various colored lights and a buzzer all of which are caused to operate in various modes to apprise an operator of when the wrapping process is beginning, whether or not twine or surface wrap material is present, when wrapping is complete and when the surface wrap material has been severed.