I wired my KC Daylighters to my brights, when I turn on my brights they come on and I love it.. well, I got some nice fog lights and went to do the same with my dims and the fog lights.
It didn't work.. I pulled out the voltmeter and saw that I was getting a whole 10.5v with my Bronco running to the low beams?! What in God's name? Not enough to flip a fricken relay?

I also connected my brights to my dims at the switch, so I would get dims with brights (love this mod). When my brights are on I get JUST enough voltage to flip the relay, turn them off and the relay de-energizes in 3-4 seconds.

I can wire the relay direct to the battery but I really wanted them to come on with my headlights, grr.

Is there any way I can boost headlight voltage just a tad? Maybe add a second ground to the harness? I'm not sure if the switch or dimmer breaks ground or positive, found out the hard way that my blower switch breaks ground when I tried to run a direct ground to my blower and I'm guessing the headlights will do the same (causing an always on condition, or brights always on or something weird)

 

RJM Injection Tech — Headlight Harness

Here you go.