Try it with the truck running cause the ballasts need full power to illuminate the bulbs. If not then Make sure polarity is correct then check ballasts.I need a little help. This morning took the time to created a wire harness for my light rack and convert my middle 2 to HID. I went to test them on a battery I had laying around (12.43Volts) and none of them turned on. I checked continuity through out each plug to see if I fucked something up (typical reason) but everything checks out. I tried them all individually and I was only able to get one to fire up. My question is, does my truck need to be running to get these things to fire up? Maybe not enough amps off a battery of itself?