By "not working", I assume you mean it shows neither charge nor discharge. Your ammeter may not be bad, but lack of indication could be a symptom of the real problem.
Ammeters work by measuring voltage across a shunt. The shunt may be part of the meter, or (typical in autos) it can be remote from the meter. If you have heavy gauge wires going to the meter, the shunt is part of the meter. It the meter movement blows, the shunt will continue to pass current. It's unusual for a shunt to fail (they'll take at least 100 amps), but it's not uncommon for the shunt wiring to break. Also, there's often a fuse or fusible line inline with the shunt. Follow the heavy gauge wires from the gauge back to wherever they go, you'll probably find the problem.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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