On another look it is just that C1 is backwards. The + should go to the positive suppy voltage.
But seeing your wide voltage range makes me think a simple divider may not work well.
If you set the enable voltage to 2.2 volts (maximum turn on spec) at say 15 volts (higher than 14.4 by a small margin) then you got a part that turned on at 1.2 volts (minimum turn on spec.) it would want to turn on at 8 volts or so. (below the 14.4 spec. you have). A better solution might be to use a comparitor set to 15 volts to just switch the enable between 0 and 5 volts.