M8580 charge system troubles

[mb1995]

Have a M8580. When started, lights indicate "alarm against electrical charge system troubles". Took alternator to test, no problems with it. Any other suggestions as to where to look from here?

 

[E/S]

Does the alarm go away when you increase rpm ?

E/S

 

[whitetiger]

Clean both positive and negative cable ends at battery, clean ground cable end where it bolts to tractor and positive cable end at starter. A good share of the time it is where ground cable is bolted to the tractor frame.
Also check the fan belt tension.

 

[mb1995]

Yes, when I increase the rpm the lights go out. Replaced battery a short while ago, so re-did connections at battery, but will check the others. Thanks for the info.

 

[E/S]

Pull the alternator and have it checked. Could be a bad diode or a loose belt.

E/S