Very likely a jacked up wire somewhere or a short. What exactly is happening? Flickering or something or what? This might be a good excuse to buy the DEPO projectors btw. They are powered directly from the battery and have their own relays/harness.
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.