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Good Morning TJ, The answer depends on if you're at positive or negative ground, cuz if wired backwards, the ammeter would read backwards i.e. show discharge when charging and charging when discharging. All 2 cylinder John Deeres were shipped from the factory as positive ground. The conventional wiring on most tractors is for one of the ammeter leads, the "supply side" to be connected to the ungrounded battery post, either at the battery itself or more often to the starter terminal which has the big cable leading to that same post, and thats the only wire on that terminal. The other ammeter terminal, the "load side" is what feeds all loads (except usually NOT cigarette lighters) such as lights, switches, and igntion PLUS the BAT terminal on a Voltage Regulator (or BAT on 2 wire cut out relay systems) so the generator can get to and charge the battery. On many ammeters, the terminals are labeled + and - , and on negative ground autos most were connected as, the + was the "supply side" and was wired to the + battery post whie the - "load side" was wired to lights and ignition and switches and voltage regulators etc. However, at positive grond that would be reversed, the + terminal would feed the loads, while the - terminal would be wired to the ungrounded negative battery post. If you wire yours up and are unsure, wire one terminal (only wire there) to the ungrounded battery post or starter post with the big battery cable,,,,, ,,,, and wire the other side to all loads like lights or switches and ignition PLUS the BAT terminal on a Voltage Regulator or Cut Out relay. Then turn on the lights or ignition etc., (without starting the tractor) and the ammeter should swing to discharge, but then swing to charge if the tractor is startred and ran at fast RPM if your chargign system is working. If it does just the opposite of that, reverse all the leads. DO NOT forget the generator has to be wired on the ammeters "load" side with the lights and switches and ignition etc., so it can get to and charge the battery. That way the ammeter will show whether or not net current is flowing out of the battery (discharging) or into it (charging). Hope this helps and answers your question. Good Luck n God Bless John T Nordhoff in Indiana
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