As has been said you can interchange the wires on the ammeter and it will read +30. However it should decay to 0 amps when the battery is charged up. I would make sure that the voltage on the battery falls between 13.8 volts and 14.5 volts when running. No more no less. A sustained 30 amps may indicate overcharging if your battery voltage exceeds 14.5 volts. The 30 amps could indicate a large electrical load as well.
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