Abstract: A control head for remote actuators on a vehicle heater/air conditioner system comprises variable resistors operated by control knobs to provide variable motor control voltages to the actuators which comprise servo-actuators or a pulse width modulated blower motor. The control head has a molded plastic housing with embedded conductive runners terminating in wipers. A control disk rotatable with each knob has an arcuate resistive film and a pair of arcuate conductors connected to ends of the film. The wipers engage the arcuate elements to apply a supply voltage to the conductors and pick off a control voltage from the resistive film. Alternatively the arcuate elements are on the housing and the wiper is on the control disk.

Abstract: A circuit board has a socket opening for a twist-in lamp bordered by a pair of arcuate conductors. The circuit board is configured to define a socket for a bi-pin lamp located concentrically within the opening and supported by bridges across the opening. The bridges carry conductors for the bi-pin lamp. The bridges are frangible to allow the socket for the bi-pin lamp to be removed. When a bi-pin lamp fails in service it is removed along with its socket and a twist-in lamp is installed in the remaining socket.