Yes they all were positive ground and by hooking it backwards, negative ground your gauge will real just like you say, backwards. I would turn it around and then polarize generator. Do this by touching battery terminal to gen terminal(just a flash is all it takes) at cutout or regulator which ever you have. This may solve your charging problem or then again it probably won't. If it doesn't charge, you can ground the field terminal and if it charges then you know gen is ok and grouding of the field is problem. I you have high low charge position on light switch the field is supposed to ground directly on high charge and through a resistor on low charge. If you have a regulator then that would be the problem. Pitted or burned points or maybe reglator itself not grounded.
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