so i went and picked up an alt. today at the pick and pull because mine has been screwy for a year now. Well before i put this new one in i had to remove the 4 screws holding the front face on and rotate it 180*. Once it's installed i start the truck up and theres no charge. Any ideas? it's i very new looking alt i pulled from a 86 lesabre. AC delco 105amp. Any help would be great.