Posted by Owen Aaland on June 19, 2010 at 13:53:47 from (65.165.246.246):
In Reply to: Alternator troubles posted by Keith in Iowa. on June 19, 2010 at 04:50:33:
Zachary Hoyt said: (quoted from post at 07:50:33 06/19/10) I put a new Delco 10SI alternator on my H to replace another one that stopped charging. The new alt worked great for about 2 months and now when I pull the knob to charge the ammeter shows a slight discharge, around 5 amps. The battery voltage drops when I pull the charge knob and then whe I push it in again it rebounds. The PO rewired the tractor right before I got it, so I haven't worked on the wiring at all. Is this just an internal alternator problem or could I have a wiring problem that is killing them slowly? Any advice is very much appreciated.
Zach
Since it was working before I'm going to assume that the wiring will do the job. The 5 amp draw indicates that the brushes and rotor are working correctly. (The rotor winding should have 2.8 ohms resistance and assuming a fully charged battery at 12.6 volts results in 4.5 amp draw.) At this point the regulator is doing what it is supposed to do. Until it reaches the upper voltage limit the regulator grounds the brush lead. If it were open you would not be getting the draw with the switch on.
With the engine off, check to make sure you have battery voltage at battery terminal and on terminal # 2 at all times. You should have voltage at terminal # 1 only when the charging switch is on. If that checks, out the problem is inside the alternator. A shorted stator and/or blown diodes are the most likely cause of your problem.
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