One possible answer is to just get a true one-wire alternator, attach it directly to the "load" side of the ammeter, and be done with it.
If you are determined to make this work, and you have a correct internally regulated Delco 10SI style alternator, you can completely disconnect the excite wire, and manually excite the generator by running a jumper wire to your starter switch, and manually touch it there momentarily after the tractor has started and is running at about 1/2 throttle. If it starts charging, all you need to figure out after that is where to get an LED or a diode.
You do have the BAT wire from the alternator connected to the opposite side of the ammeter from the battery, right? If you connect to the same side, it is bypassing the ammeter and won't show a charge, though it will be charging.
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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