Finished mounting cabin heat cable and attaching to heat box. Cable has too much resistance due to extra curves because of locating it on right side of panel. Cable did not actuate flapper correctly. Also, the flapper door will not close completely due to gasket bending back of box and interfering. Will trim gasket to correct this issue. Plan is to relocate cable to come from starboard side and actuate heater. Frustrating day not making any progress.