Alternators Dieing After Using Just A Few Hours

[KCTractors]

Converted a WD Allis to 12 volt Delco alternator with built in regulator. The tractor is not used much, just this last 3-4 months, it went through 3 alternators already. Put in a new battery at the time of converting it. I converted maybe 20 to 25 different tractors and this the first one that giving me problems. The alternators are coming from FleetFarm
 

[glr62]

what is happening to alternators, regulator, diode?
 

[old]

Sounds like you need to switch where you buy them from. I get all mine form O'Reilly's due to the fact they come with a life time warranty and have yet to ever have much of any problems with them. Ya it works best if you tell them you want an alternator from say a 1980 Chev pick up no power any thing with say an 350 engine and doing that is just so the guy behind the counter does not have to think hard LOL
 

[Zachary Hoyt]

The Delco 10SI alernators are very easy to rebuild, I just did one this afternoon and to do a complete rebuild only takes half an hour. Folks on this website told me and once I opened one up it was obvious how to do it. You can get a complete rebuild kit with all of the screws, the bearings, brushes and holder, regulator, diodes and rectifier for just over $20 on ebay and there may be cheaper sources that I don't know about.
Zach
 

[buickanddeere]

Heat failure from lack of circulation or proximity to exhaust? Continuous high output to charge a large nearly dead battery will smoke some alternators. A 35 amp rating means 35 amps for a few minutes and 20 amp continuous.
Low rpms which is not spinning the cooling fan fast enough?
 

[cole in mo.]

You didn't for any chance forget to change the ground from + to -?
 

[Butch(OH)]

My guesses are same as B&D and Old.
On a Ford PU we once killed two rebuilds without getting out the shop because the batteries were run clear dead and we would jump it to start it. If not a dead battery or short I would guess you need to try a differant supplier.
 

[oldtanker]

FF alterantors and starters don't have a real good rep.

Rick