Went to pole barn. Took ammeter out of tool box. Connected left post of meter, left post when viewing ammeter from above, to negative of battery. The right side of meter got connected to a light bulb. The other side of bulb got connected to the positive of battery. So when electrons travel from left to right, Ammeter shows discharge.
Electronics 101: Electrons leave the negative post, go throught ammeter, travel through load and return to the positive post.
So when viewing ammeter from above, electrons were traveling left to right, meter showed discharge. This is opposite from what I posted below. SORRY
During charging, electrons are being forced in to the negative post of battery and they come out the positive post. The electrons are traveling in to the right side of ammeter and leaving the right side.
The real test is very simple. Wire up meter, turn key on, meter should show disharge. Turn head lights on, discharge. Turn tractor on, if generator or alternator is working properly, will show charge. Use voltmeter to confirm charging system is working, the battery voltage will increase to around 14-14.6. All the above should work reguardless is you have + or - ground.
I'm sure there are others who have a library full of circuit diagrams for different tractors.
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