A center wire on an ammeter sounds kind of odd -- it's a simple gauge and usually involves just two terminals one to hot, the other to ground and it measures the juice running betwen the two-- so I'm not sure what a third terminal would do. It is the back of the ammeter you're looking at and not the switch, right?
Check out the diagrams at the link below. They might be of help in sorting things out.
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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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