Alternator went out on John deere 7320 tractor. Carried it to vocal alternator & starter shop to get it rebuilt . Bearings were down. Got it fixed. Put it back on an every time u crank it a warning code comes up saying check alternator or v- belt. You can idle it up a couple hundred rpm an then back to idle an the code goes off an does not come back on until you cut the engine off an re-crank it. Battery is staying charged up. Needing information on what my trouble could be.