A feed mixer truck for mixing feed and for discharging mixed feed into an elongated feed bunk. The engine of the truck is mechanically connected to an electric generator which is electrically connected to an electric motor for driving the drive wheels of the truck and which is electrically connected to an electric motor for operating the feed mixer augers. The electric generator is also electrically connected to an electric motor which operates a feed discharge assembly. A control is electrically connected to the motors to control the operation thereof.