Headlight Flasher Question..

[Gregorylights]

Looking to add a Headlight flasher to my fleet of Emergency Lights on my 96 Yukon.. But I'm trying to figure out if I need to get a Positive Switching Flasher or Negative Flasher for my high Beams.. If any one could help me out..

Thanks
Taylor
EMTB

 

[SunlitComet]

positive power is switched to operate lights.