Remove the Gutter Helmet from the eave-trough by folding up the tabs and pulling it upwards with your hands. Be careful not to damage the material when removing it.
Run one of the heating cables in the bottom front of the gutter, starting at the furthest point from the downspout. Secure the cable to the bottom front of the gutter with aluminum tape every 3 to 4 feet.
Insert this cable into the downspout and push it until it comes out the bottom. Run the remaining cable to the nearest outlet.
Run the second heating cable along the top of the mounting brackets for the Gutter Helmet. The cable should be secured to the very end of the brackets with a small amount of aluminum tape. When the Gutter Helmet is reinstalled the pressure helps to hold the cable in place.
Insert this cable into the downspout and push it until it comes out the bottom. Run the remaining cable to the nearest outlet.
Reinstall the Gutter helmet reversing the process used to remove it. Plug the heating cables into the exterior wall outlet.