John deere 7320 alternator

[mb bailey]

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.

[Tx Jim]

Sounds as if alternator belt needs tightening to eliminate belt slippage on initial start-up or rebuilt alternator must attain a higher than idle engine speed to begin charging.

[jd110]

Another possibility is incorrect belt routing. Sometimes the serpentine belt can be installed different ways. This can result in low tension or not enough belt wrap around the pulley.

[RickB]

Poor connection/high resistance in the excitation circuit or within the alternator itself.

[cowski]

+1 rickb .run it some more it may clear up.brushes may not be seated yet.