I had a bad ballast when I got mine from stangmods. Both worked at first, then one went out. One worked and one didn't. I thought it was a fluke, so I switched the ballast and the other bulb blew too. So I sent it all back and they sent me another set because it was warrantied, it just took like another month, and they sent me the wrong temp back, but I just kept em' and they've worked fine ever since. All the ballasts I've seen allow the harness to only be plugged one way, so I don't see how polarity could be wrong. Not sure about all of them though. Don't think this helps much, but that's my experience, so I would check the ballast connections and make sure they're plugged correctly.
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2002 Mustang GT, 271hp/306tq on 87 CMR Tune, Roush short throw rally style shifter, King Cobra Clutch, Roush CAI, C&L Plenum, BBK/Roush 75mm T/B, Kooks L/Ts w/catted X, Flowmaster American Thunder Cat-back, Eibach Pro-kit Springs, Energy Suspension bushings, KYB AGX's, Hotchkis C/C plates, UPR ProStreet rear control arms, Brembo Drilled/Hawk pads, BFG's, Dual Halo Projector 8k HIDs, Kenwood: KDC-X790, KAC-9102D, KAC-8402; Infinity: 6810CS, 6812CF; Orion: P series subs all powered by Optima 
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