Are you saying use the plug off the original setup, or are referring to another plug, sorry I'm new to the big dog, owned lots of HDs.Go ahead and change the plug while you're in there. Make sure it fits tight. If you are installing the Daymaker, you will have to loose the rubber gasket
Just dont drop it as you are installing. They will break on concrete....how do I know? Lol.I like and use the "Ceramic 3 prong plug". You'll never have to worry about the plastic plug burning out, leaving you without a headlight. Cheap fix, around 4~5 bucks