Abstract: An alternator pulley misalignment gage that allows a worker to determine inboard and outboard alternator pulley misalignment during the manufacture of a vehicle engine. The misalignment gage includes a cylindrical member that is removably secured to an extending arm member so that the cylindrical member can be removed and other cylindrical members can be secured to the arm member for different engine configurations. A measuring device is attached to the arm member opposite to the cylindrical member. The cylindrical member is configured to be magnetically secured to a crankshaft pulley of the vehicle by a plurality of magnets. The measuring device includes a spring biased pointer that is slidably movable relative to the arm member in a direction substantially perpendicular to the plane of the arm member.