Then I'm afraid to say the regulator must be toast, the red wire is connected internally to two diodes, there should be no current flowing back in.
Look at the simple schematic I posted earlier.
I would also inspect the alternator where the wires connect and test for a short, it seems strange to me that the current would flow back through a diode and an SCR.
A stupid question - you don't have the battery connected backwards somehow?
Roy
Thanks for the help, Roy!
The battery is connected properly. I will test the alternator. With the bike completely off, the red wire holds the same current as the battery. Is this how it should be?