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Message: <blockquote data-quote="evilcw311" data-source="post: 874086" data-attributes="member: 12926">Part of the problem that people are having with the HID's pulling an ABS light is that they are powering the ballast straight from the headlight harness. there is 2 major problems with that, 1) the ballast pull more power than what that circuit is designed to give, this is why is it best to power them from the battery via 12v relay that is triggered by the headlight wires. 2) the headlight and foglight wiring shares the same ground wires as the ABS system and as you should already know you technicaly draw your power from the ground wire, NOT the power side as most people commonly mistake. So again if you use the relay to power these and give them their own ground to the frame away from welds and not on an existing bolt than this will solve your issues. Other cars will have similar issues due to the same reasons, may not always be abs but something due to sharing a common ground with other devices and sensors.Not all mustangs will have the problem due to the fact that either they are powering theirs from the battery or ground wires might not be as inufficient as others. our cars are prone to ground problems and this is no different.</blockquote>