YES a typical Delco Class A Generator has the ARM and FLD posts REGARDLESS if 2 or 3 brush.
One way I have converted an old 3 brush genny (that used a manual Low High light switch charge control) to use like a 2 brush (with a properly matched 2 brush Voltage Regulator) genny is simply remove the old third adjustable brush and then the non grounded brush (which is 180 opposite the grounded brush) has its small flexible feed wire connected up to where the gennys internal ARM post wire is attached. Then use a proper (Delco literature if you can locate?) 3 terminal VR with BAT FLD and ARM. If before the gennys FLD post wired up to the light switches Low High charge you now remove that wire and instead wire the gennys FLD post to FLD terminal on the new VR......Bat on VR to Load (not battery/starter) side of ammeter..........Gennys ARM to Gen/Arm on new VR......
I have also just set any adjustable third brush to max charge location (close as possible to the fixed brush by it) and used a 3 brush VR BUT THATS NOT MY ADVICE OR RECOMMENDATION even if it can work. I doubt you will regulate and control the exact and enough field current to allow the genny to produce its max output if you do that but hey it can still work.
The old 3 brush used the third adjustable brush to regulate charge by moving the third (its where Field circuit and current starts) adjustable brush farther away from the fixed brush to reduce field current and instead of a full fledged Voltage regulator they used a Low High manual charge control. Then they went to a full fledged VR which automatically regulated field current.
Your tractor your choice but getting the best and correct new VR nowadays to match especially a modified genny may be hard HOWEVER what youre talking about or my advice can still pump some degree of charge to the battery and even if all new and perfect those may have only pumped a few up to say 10 or 20 amps !!!
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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