Guitar Shop 101: The ABCs of Output Jacks | Premier Guitar Mar 25, 2016The most common output jack for electric guitars is the mono jack. It has two lugs: One is the ground, and it’s part of the jack’s interior or case. The other lug is the hot or primary lead.Author: John Levan How to Wire a Guitar Jack | Our Pastimes Unscrew the jack plate and carefully pull the jack away from the body of the guitar. Cut the wires connecting the jack to the controls. Cut two lengths of new guitar circuit wire, one approximately 6 inches long, which will serve as a ground wire, and the other long enough to reach from the output jack to the pickup selector switch, if the guitar has one. This is the hot wire.