Small Engines (Lawn Mowers, etc.): Troubleshooting battery charging circuit, Kohler CV490S, craftsman lt1000, exact specs

Question
This engine is mounted on a Craftsman LT1000 riding lawn mower. Decals show Kohler Pro 17OHV, Model CV490S, Spec. No. 27508, S/N 311005213. The ammeter shows discharging.
I've replaced the regulator twice in the past. After replacement, each time it showed charging on the ammeter, and everything runs fine, which seemed to show the alternator was working. It also runs when I apply the brake, disengage the blade clutch, and get off the mower (I was questioning switch operations and trying to put off doing continuity checks.) While running, voltage output at the regulator is 12.2 volts DC, regulator connected. (I'm guessing this is just the battery voltage off the new battery).  AC voltage at the terminals for the alternator shows 1.4 volts AC at the connector to the regulator, with the connector disconnected (this has two other wires connected to it though). Schematic says it should be 28 Vac. I just can't believe something can be wrong with the alternator (pretty simple thing) or that I keep having to replace regulators. I don't know how to check regulator output (no ammeter going that high), and I think if I disconnect the battery terminals with the engine running, it will just die, not getting me anywhere.
I'm wondering if there is a history of problems with the regulators or alternators on these engines.
Seems like a great website.  Thanks.

Answer
Lonny:

I don't have any manuals here to give you the exact specs your seeking, but this engine did have some charging problems in the late 90's.. like 1998, 1999, is your tractor of that vintage? Don't hold me to this, but it was actually a rectifier that was the culprit.  The rectifier was mounted on the tractor Chassis, not the engine.  IF  (and i use the word IF) I remember correctly it was located on the right hand side of the tractor (as your sitting on the seat) near the deck lift lever.

I suggest you try to get some facetime with an EXPERIENCED  SEARS service tech or a Husqvarna dealer that sells that style tractor (Husqvarna-Sears same factory) and can maybe shed some more light on the subject.

You should be able to disconnect the battery terminals without the engine killing unless it has a wire going to the bottom of the carb.

Hope this helps point you in the right direction.  Electrical problems can be a real headache sometimes.

David R