WITH THE TAGS MISSING , ABOUT THE ONLY WAY WOULD BE TO TAKE THE ALT APART AND GET THE NO,S FROM THE REGUALTOR, , BUT IF YOU ARE SURE OF THE 75 AMP , JUST BOLT IT ON, YOU ARE CORRECT IN THAT THE TROOPERS AND OR THE RODEOS THAT WERE BASICALLY STRIPPED DOWN OF THE ELECTRICAL GOODIES CAME WITH THE SMALL ALT OR RATHER LOWER OUTPUT , UNLESS IT WAS CHANGED SOMETIME IN IT,S LIFE AND GOT THE 75 AMP UNIT IN IT,S PLACE / JERRY