Make your Xbox switch to AV mode automatically

Step 3 Adding the cables

Cut the cables

Find the corner bend of the cable near the right corner of the Xbox. 

If you have a widescreen TV
Cut the red and the black cable

if you have a regular TV
Cut the yellow and the black cable


Now strip 10 mm (<½ inch) of plastic from all cables and solder the thin red cable to either the red (if you cut the red cable) or to the yellow cable (if you cut the yellow cable) then re-solder the yellow/red cable back to is original state and cover with shrink rubber.
Then solder the black cables together and cover with shrink rubber. Heat shrink rubber until they fit well around the new joint. 

The Xbox has a perfect hole to run the cables out from the shielding metal very close to were we made our first cut.

Tip
If you have a hard time soldering the cables together adding a hair band to the pliers will make a great DIY holding clamp.