I bought the Hopkins power converter for mine. Its a 4 wire but has a seperate brake wire if you want to use it. Gets its power from the battery instead of the bikes system. Easy to install and works great. I saved the 5th brake wire for when I add the extra brake light to my trailer. NAPA Part # 755-1596 About $45.00 or so.
Many Roads To Ride, One Life To Live, Do Both On Nobody's Time But Your Own