If you don't have DRL's (daytime running lights), the easiest place to pick up the high beam wire, is up on the light themselves. It will be after the high beam relay. You don't mention your vehicle and year, so turn on your high beams to figure out which light bulb gets turned on. Turn them back off and let them cool, and then take the bulb out of the back of the reflector for the high beam.
You'll have to look at the wires and the bulbs, and will probably need a digital voltmeter to figure out which wire is the +positive feed to the high beams, and which wire is the -ground.
On the other hand, if you have DRL's, you have to determine if the DRL's use the high beams as the DRL. If they do, then they typically do that with a set of relays and run the high beams in series (DRL mode), which cuts the voltage in half so they are dimmer. In regular high beam mode, the beams are run in parrallel so they get full voltage. This is usually handled electrically with a couple of relays. You do not want to mess around with the wiring if your high beams are used as DRL, as they will only have 6volts on them as opposed to 12v. You'd have to pick up the voltage off of the headlight switch or prior to the relays, and will undoubtedly need a wiring schematic for your specific vehicle.
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