I would say it has something to do w/your drl's... if they're anything like my TBSS, then they need to be killed... drl's typically run at 70% power and about 10V instead of 100% power and 12V when your headlights are on, and the signal is pulsated for drl's... the relay harness simply protects your stock wiring harness.. it has nothing to do with drl's... I know for the trailblazer platform we can add a diode to make the drl's run at 100%, but I'm no sure about the GP platform..