Anyone having alternator problems should ck the cables, both pos+/- where attached to alt, frame, panels, etc. loose connections can/will cause alt to overheat & seize up, break belts. Tendency is to blame the alt when it may be something as simple as a loose cable.
We went thru 5 alternators (24volt) on our MCI (6V92TA) in about 12 months due to a loose pos cable. All were R&R by Stewart Stephenson in Dallas to Newport News, etc. finally a bus buddy/mechanic was doing something else & pulled on the pos cable & it moved. He took it off, cleaned the end, etc. & reattached. He also found we had incorrect belts (4). I've forgotten what belt it takes but I carry a spare set. The SS mechanics never ck'd the belts or the cables.
These alt's are heavy & require a hoist. I seem to recall they weigh 200-300 lbs. not to mention, you just about can't get to the thing.
The loose cable was causing the alternator to kill itself when it lost contact, it would overheat & fry.
May not be your problem, but if this helps one person-----
James
MCI 8
