From memory there is an unswitched blue/white auxiliary power lead in the headlight shell and a yellow/black earth lead. These have nothing to do with the headlights so if these are the leads you are using and it affects the light then something else is going on. I suspect you've compromised the power/earth leads going to the headlights. For the record I'm not sure you'd want to use an unswitched source for GPS because it might drain the battery even if not in use - but could be wrong there? You might be better off tapping into - say the tail light power lead as that is active when bike is running. No use using the headlight leads as they alternate depending on high/low beam.
2008 VN900 Vulcan Classic
2014 Triumph Thunderbird LT
Last edited by fawlty99; 11-06-2012 at 04:44 AM.