The Karoo Development Front has ended its coalition with the Democratic Alliance (DA) in the Beaufort West municipality.
The party says in a statement that it will now go into coalition with the African National Congress (ANC).
The KDF wrested control from the ANC after the 2016 Local Government elections.
The DA and ANC both had six seats each and the KDF was the kingmaker.
The ANC and KDF have agreed that a representative of the KDF will take up the position of mayor of Beaufort West.
KDF leader Noel Constable says he is not prepared to speak on the matter yet.
Meanwhile, the ANC has taken back control of the Beaufort West municipality after the KDF ended its coalition with the DA.
The DA went into coalition with the KDF after both the ANC and DA secured six wards in the 2016 Local Government elections.
KDF says a breakdown in communication between them and the DA, and a lack of consultation when the DA made certain decisions in the council, is among the reasons the party has decided to split from the partnership.
The party says in a statement it has also noted that tenders have been unfairly awarded to certain contractors in the area under the DA led administration.