The "current draw" test you mentioned should help locate the cause of discharge. The battery is connected to the BAT terminal on a Voltage Regulator and theres no other connection from the battery direct to the genny whereby the genny is draining your battery as you ask. Inside the VR is a Cutout Relay between the VR"s BAT and GEN/ARM which is supposed to open when shes off (so battery dont discharge via genny).
HOWEVER as Bob noted if the Cutout Relay portion of the VR is sticking closed, then there is a low resistance very high curent discharge path (to drain battery) to discharge the battery via the stuck cutout relay and the genny via its ARM post.
If you were to loosen or remove the genny belt if the cutout relay is indeed stuck THE GENNY WILL SPIN. Its supposed (if not sticking closed) to open when you shut the tractor down but close once the genny is charging so it can get to and charge the battery via the closed cutout relay inside the VR.
Also if the cutout relay is stuck, when you shut down there would be a high discharge reading on the ammeter and the genny will get HOTTTTTTT and again the genny would spin if the belt were loosened !!!!!!!!!! if that happens upon shut down and the ammeter reads a heavy discharge see if it stops if you remove the wire off the BAT terminal?? If so then the cutout relay is sticking.
HOWEVER IF THATS NOT THE PROBLEM (such will discharge the battery and heat up the genny very rapidly) then theres perhaps a higher resistance lower current draw slowwwwwwwww dischage thats running the battery down UNLESS THE BATTERY ITSELF IS BAD?????????
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