I'll bet your tractor is wired wrong. Have you traced out the wiring following a wiring diagram?
The action you describe could indicate the ammeter is hooked up backwards, and the lights are wired to the battery side of the ammeter.
The ammeter should be the first thing from the battery, except for the wire to the starter. If the lights have been wired to the starter post then they will draw through the ammeter. If the ammeter is backwards, current to the battery would show discharge, so if when battery is charging and when lights are turned on, there is even more amperage, so more indication of discharge.
Does the ammeter show discharge when the lights are turned on with the tractor off? It probably shows nothing, because the current does not have to pass through the ammeter.
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