The present invention provides an electrical connector assembly for use in a high-power application, such as with motor vehicle electronics, that exposes the connector assembly to elevated temperatures and thermal cycling. The connector assembly includes a first electrically conductive connector formed from a first material, an internal spring member formed from a second material residing within the first connector, and a second electrically conductive connector with a receptacle dimensioned to receive both the first connector and the spring member to define a connected position, wherein the connector assembly withstands the elevated temperatures and thermal cycling resulting from the high-power application. To maintain the first and second connectors in the connected position, the spring arm of the spring member exerts an outwardly directed force on the contact beam of the first connector to outwardly displace the contact beam into engagement with an inner surface of the receptacle of the second connector.