An implantable electrical stimulation system includes a control module electrically coupleable to a lead. The control module includes a housing, an electronic subassembly disposed in the housing, and a connector assembly for receiving the lead. The connector assembly includes a port for receiving a proximal end of the lead. Connector contacts are disposed in the connector assembly housing and electrically couple to the electronic subassembly. The connector contacts align with terminals disposed on the lead to form an electrical connection between the connector contacts and the terminals when the proximal end of the lead is disposed in the port of the connector assembly. A disconnecting feature includes a switch for electrically disabling, or at least significantly reducing, the electrical connection between the connector contacts and the electronic subassembly when the switch is opened.