ballasts are the most common problem with cheap HIDs, also bulbs can be also. Swap each side and see if it transfers, just start with the ballasts. If it transfers then get another ballast, if it doesn't, swap the bulbs. If it still is on the same side you have a voltage problem. Ballasts won't continue to run with an under/over voltage condition, they have a set voltage range they work in. Sometimes it requires using a relay kit to use power directly from the battery to keep a constant good stream of 12v. Most of your smaller circuits in newer cars have quite a bit of voltage fluctuation as accessories get turned on/off, they're pretty sensitive to minor voltage drops.
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-Chris
**83 Turbo 280ZX** - Megasquirt 2 v3.0 Stand alone EMS, n42 head swap (8.3:1 cr), n42 intake, 60mm throttle body, z31 watercooled T3, NXS Manual boost controller (12psi) MSD Blaster 2 Coil, Apexi 3" Turboback Exhaust, Exedy Stage 2 Clutch, Greddy Type-S BOV, DNA Motoring FMIC, Walbro 255 Fuel Pump, CX Racing SR20 Radiator, Custom Ram Air Intake, Suspension Techniques Sway Bars, Eibach 2" Pro Lowering Springs, Tokico Blue HP Shocks, Energy Suspension LCA, Subframe, & End link Bushings
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