Posted by Owen Aaland on December 27, 2009 at 02:03:03 from (65.165.246.148):
In Reply to: 186 electrical problem posted by Bernie Steffen on December 26, 2009 at 17:26:34:
Mike 186 said: (quoted from post at 21:26:34 12/26/09) I got a 186 hydro. The problem is the alternator doesn't charge at low idle. The volt meter gauge stays in the green if you rev it up a little but still acts erratic or it doesn't charge like it should. alternator is only 2yrs old. I was wondering if I need to change the belt. I don't have a warm shop so any pointers would be greatly appreciated.
Certainly check the belt but if I had to make a guess as to what the problem is I would say that vibration has shorted out the stator in the alternator causing it lose a lot of its' output amps.
A lot of rebuilt alternators have the stators reused when they are rebuilt. On tractors and other farm equipment the heat and vibration is usually what kills the alternator. Most stators use paper spacers to keep the stator windings from rubbing on the stator laminations. The heat dries out the paper causing it to become brittle and loose and then vibration wears the insulation off the windings. If part of the stator windings have turned black it is an indication of them being shorted out. They change color when they are overheated.
The other problem that is real common is the brushes wearing out in the holders and sticking. Your tractor should have a 10SI, type 116 which has swing style brushes instead of sliding ones. That change eliminated a lot of brush problems on the tractors.
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