Price: $15.00

Brand New Wire Power Relay kit
Fit: H8 H9 H11
This HID Power Relay allows you to connect your HID Kit power directly from your battery.

Why we have to add a relay.
Hid Kit drop power from 55Watts to 35Watts; therefore, it require more power to start which overloads your light switch and wiring. Eventually, you could burn one of them. Adding a Relay allows the kit to get power directly from the battery instead of your harness from your vehicle or bike.
If you have Day-Time Running Lights (DRL) or Autolamps (AL). The problem with these is that most of the time, when your DRL or AL lights come on, they do not send the same amount of power. This drop in power may cause 1 light to come on and the other stay off. Adding a Relay will provide stable/constant power to balance the power to your HID kit.

link for installation guide: