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Please let me know how to rectify the problem. The ammeter has been working fine for almost a year. It just started giving this problem recently.

The amp reading on my EMS-D120 is reading -29Amp on idle speed. If I increase the RPM to 2000Rpm the reading change to -30, -31 and -32 at 2000RPM. The voltmeter is working fine. 12V at idle and goes up to 13.8V at 2000RPM. I then swapped the thin leads around on the shunt. Now the reading is...