This could be done a number of ways. I recommend against using the factory wiring though. You may use it as the switch for a relay but I would feed the lighting right from the battery with a relay in the middle. You may be very surprised at how much brighter they are. Use new headlamp sockets too, they're only a few dollars each and come with much higher gauge wire than the factory sockets. If you need I can put together a full diagram but otherwise I'll just post up a text walk through later tonight or tomorrow.
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