[JSeery]

Then you have reversed the current flow. This will work for some functions like lights, dash gauges, starter, etc. But it will not work correctly for the coil or the generator. It will reduce the coil output around 20%. Is there any reason to not connect it correctly?

If it has an external coil (can shaped coil) you can reverse the terminals so that it will function correctly, if you want it to run it reversed for some reason. Same with the generator, it can be setup to run with the reversed polarity.