brake lights will not turn off

Might depend on the model year, but there should be a little switch behind the brake pedal that gets pushed when you press on the pedal. That switch is likely stuck or broken.

I was told the switch behind the brake pedal is hooked to the brake booster and has nothing to do with the brake lighthttps://www.google.com/search? q=82+ford+e350+xl+conversion+brake+light s+will+not+turn+off&oq=82+ford+e350+xl+c onversion+brake+lights+will+not+turn+off&a qs=chrome..69i57j69i33.187729j0j4&sourcei d=chrome-mobile&espv=1&ie=UTF-8s