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Old 01-30-2013, 06:50 AM   #7025
davek181
Studly Adventurer
 
Joined: Aug 2007
Location: Idaho
Oddometer: 754
The blue wire is power, the headlight is grounded to the system and powered to turn on. That is why I suggested that as a relay trigger. No matter either way, a relay can be grounded to turn on also though I prefer the other way. I have seen in auotomotive applications where headlights are powered and switch on through grounding, though in my experience that method seems more problematic for some reason.
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