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if they blink then one are both turn off, you need a relay. HIDs pull more current to start. the relay will pull power directly from the battery to give it the extra power it needs to start. im sure thermo will be here soon to answer it in more detail if needed
I resolved my problem with the radio restarting when I turn on the headlights and high beams by building a relay harness to power the low beams and running power directly from the battery. I also looked through my factory Ford wiring diagram book snd the low beam plugs are reversed from the high beam plugs. I have to put in another relay harness to power the driving lights because it is still causing the high beam indicator to faintly glow.