their site has common problems in their support section and this seems to be my problem.
"If sometimes one side does not turn on or it takes multiple tries for the HIDs to turn on, you may have a power issue. We would recommend trying a wiring harness. This will allow you to wire the kit directly to the cars battery. Sometimes if you bump your fuse by 5amps that can help as well. If the problem stays with one particular side, we would recommend swapping the bulbs or ballast from left to right and see if the problem follows. If this is the case, you may have a bad bulb or ballast.
If you have the HID Harness installed and are still getting intermittent firing, double check your power and ground cables. Make sure the terminal is touching the "threaded" part of the bolt and not just the head of the bolt." Hmmm