I am in the process of converting my rear Multifunction lites to a Rizoma setup. There are 5 wires in the current Triumph setup and only 4 on the Rizoma. Those of you who have done similiar conversions, how did you handle this. There are 2 separate circuits involved and 2 grounds. Did you just solder the 2 grounds together? My dealer couldn't tell me if that would cause problems down the road!