is capable of being energized in either of two directions determined by the polarity of voltage applied across its terminals therefore when the control switch 30 is actuated to its down position v b is applied by the wiper pole 32b through the normally closed contacts cr1 a to one terminal of the motor 10 the other terminal of the motor 10 is connected through wiper pole 32a to ground and is therefore energized to rotate in a first direction which would cause the associated window linkage to lower the associated window such energization of the motor 10 will at least continue until the control switch 30 is release or until a conventional thermal overload built into the motor 10 opens to prevent damage to the motor actuation of the control switch 30 into the down position also causes the flip flop 50 to respond to the change in voltage occurring at the wiper pole 32b appearing at its clk input terminal in response the flip flop circuit 50 switches to its set state and the q output level switches from a relatively low to a relatively high state the switching of the q output of the flip flop circuit 50 to a relatively high state causes the motor relay cr1 to be energized and effect an immediate opening of the relay contacts cr1 a and closing of relay contacts cr1 b the effect is to continued providing d c power to the motor 10 and lower the associated window in the event the control switch 30 is released within a first predetermined time period in this case approximately 500 m sec the motor relay cr1 will stay energized to continue driving the motor until stall current is sensed and the stall current timer circuit 70 causes the.