Initially formed as a trio, by the two brothers Ragne (vocals and guitar) and Styrbjörn Wahlquist (vocals and drums), together with bassist Michael Backlund.
In 1977 Heavy Load recorded their debut-album "Full Speed At High Level" (released 1978), now with Dan Molén handeling the bass playing. The record company, Heavy Sound Records, went bankrupt after a while and the Wahlquist Bros. formed their own label, Thunderload Records.
After their debut, Ex-Highbrow guitarist was added to the line-up as well as Torbjörn Ragnesjö, replacing Dan Molén. This line-up released the EP "Metal Conquest" and the two full-length albums "Death Or Glory" and "Stronger Than Evil" before breaking up. A last try was made in 1985 with the single "Monsters Of The Night", featuring bassist Andreas Fritz, but split up shortly after.
In 1987, the Wahlquist Bros. kick started the band again and recorded an album together with ex-UFO bassist Paul Gray and guitarist Patrik Karlsson. The album was never released, though.