They are all ground wires. One from rectifier plugs into whichever one it fits into. Plug the other two into each other. BLACK TO BLACK.
I believe one is the kill switch for the coil and the other one is low oil sensor. They should be together or the low oil sensor can't kill the ignition.
Male to female, shouldn't matter which. If it helps, I suspect the black and white that WERE connected, are to rectifier.