wiring of SM Ammeter

How can you tell on a ammeter which is positive and which is negative? I'm wiring up the sm with new lights and ammeter, when I turn the lights on the first time the ammeter went to pos so I reverse the two wires then it went neg. When I started the tractor up it went neg, I rev it up and it still stayed negative. Does this mean my generator is not working or do I have the wires on backward? This tractor is a 12v neg ground. Sorry for all the questions.
 

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