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Originally Posted by 2RotorMotor
If the hids use 9-12v power and only 35w (which is less than basically any halogen bulb) then there is no reason to use a relay. AND BTW, if you ordered the right size for your car and the bulbs dont fit, then theres a problem. There should be no need to drill anything. I have done many installs and never should you drill anything into the housing. I have even done installs using oem hid's from other cars, and you just need the adaptor ring, which they sell at most performance shops, and silicon(sp?) it on the bulb. Wiring is easy. You should only use a relay when you are installing as an extra accessory. The is no need for a relay when using them as replacements to stock headlights.
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I never drilled anything into the housing. And NO, 35w/12v is not enough to turn these HID's on. You need a relay to get power from the battery. Once powered, it is enough because HID's use less power once running. They need something like 20,000 volts to turn on. The ballast can't produce that with mere stock wiring.
If you think you can get away with powering these on from the stock bulb wiring, then your in for some fuse blowing, possible cause of fire.