Help with a new light. W/pics

[skyjacked84]

i went to put up a new porch light an cant figure it out. the box has power "red wire nuts" light switch inside house "orange wire nuts" and the "yellow wire nuts" run to power the gfi. what wires need to be connected to make the light come on with the light switch but keep constant power to the gfi? also i was only gettin 95v from the power wire, tested other plugs inside the house and would get 120ish. i also tryed to just wire a light an pigtail to the constant hot an it didnt light up.

 

[pattenp]

(Orange/BLk,Yellow/Blk,Red/BLK go together). (Red/WHT, Yellow/Wht go together). Light/Wht goes to Red and Yellow whites. Light/Blk goes to Orange/Wht. The orange white should be taped as black.

Edit: The volts between the blk and wht with the red nuts should be 120V. The cables need a clamp where they enter the box and the box needs to be grounded.