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THE HARNESS CAN BE USED FOR HIGH WATT BULBS OR HID KITS. IT IS PLUG AND PLAY, NO CUTTING REQUIRED. THIS IS THE BEST HARNESS ON THE MARKET. WE HAVE BEEN SELLING THEM FOR OVER 7 YEARS AND IMPROVING THEM OVER THE YEARS HID uses 35W and 30 Amps. Do not use the 40 amp relay it is too many amps and it could cause damage to your ballast or bulbs. When HID ignites, for the first 5 seconds during power up, HID system can draw up to double the normal power, to ignite, the ignitor. As the HID capsule warms up, the current drops down to 35w by powering the ballast and xenon bulbs through a harness relay directly from the battery. With ballast or xenon bulbs, the high current is reduced. A relay acts as an on/off switch.This ensures that you're not over-loading your harness. 1. headlight wiring harness include relays. 14 gauge wire 2. you do not draw a higher current from your OEM vehicle harness 3. A connector will be be included to plug this harness into your OEM headlight harness

Plug-N-Play, NO CUTTING REQUIRED.