If the needle centers I wouldn't be so quick to replace it, the needle moving to Pos. when the switch is turned on sounds to me like the polarity of the system is reversed and the needle moving to full discharge when running could be indicating a proper charge but in reverse as far as the gage is concerned.
Some of them older Fords had a ammeter that the charge wire simply passed through a round loop on the back of the gage, if the wire is going through the loop in the wrong direction the polarity could be right but the meter still read backwards. If that is the case reversing the wire in the back of the gage may straighten it out.
If it is a "normal" gage the wires will be fastened directly to studs sticking out and if the battery is charged properly and hooked in correct polarity the gage can be reversed by simply moving the wires to the opposite studs.
Make sure the battery is properly charged as I have seen batteries charged backwards, Possible if the battery was COMPLETELY dead and the charger hooked up wrong.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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