If you install your HID kit and they do not turn on you may have reverse polarity. What this means is the power and ground wires are your vehicles stock harness are reversed. What you will have to do is plug the harness connector into the ballast backwards. You will be plugging in the connector from your car into the kit backwards. This will not harm the vehicle or the kit.
Note: Reverse Polarity is an issue with the cars wiring not the HID kit. Some cars come from the factory wired in an orientation that is reversed when compared to the HID kit. When using stock halogen bulbs, polarity has no effect, therefore, some manufactures will have the power and ground wires opposite of the HID kit. Some manufactures will have reverse polarity more then others. Most GM models have reverse polarity.
If both sides are flickering it can be caused by a few things. More than likely because the car can’t supply enough power to the ballasts on startup. You can check this by connecting the adapter cables on the bulbs to the battery with the bulb and ballast connected. If the kit fires up without any problems you will probably need a wiring harness.
If your car has Daytime Running Lights (DRL) if could be caused by the car quickly turning the lights on and off to give the effect that the halogen bulbs are running at half power. If the flickering is caused by the DRL you can try a wiring harness or have the DRL disabled (NOTE: disabling the DRL may not be legal in all areas, check with local laws before doing so). The flickering can also be caused by the car’s self-check system to see if there is a working halogen bulb connected. This can typically be corrected with our HID Capacitors.
One Side Doesn't Turn On
This could be caused by a bad bulb, ballast or wiring. The easiest way to check this is by swapping the bulb and ballast one at a time to the side that works to check that each component is functioning as it should.
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 HID Relay Harness. This will allow you to wire the kit directly to the cars battery. Often, if you increase 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 defective bulb or ballast.
If you have a HID Relay 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.