I have a 2015 l494 sport, and want to fit a Led light bar to the front.

The physical fitting of the light bar i can do, it's the wiring that has me a little stumped.

I want it to come on, when the full beam is activated.

I've bought a wiring harness, which comes built in with a relay and a switch. The switch has 3 wires, one of them is white, which I believe is the trigger wire.
https://www.ebay.co.uk/itm/325270007085?mk...media=COPY



With that in mind, I plan to not use the switch, but use the trigger wire, to splice into the full beam wiring of the headlight, so it comes on at the same time the full beam comes on.

Which wire is for the full beam?

I can find an earth point easy enough (lots of bolts to attach the earth wire from the harness to), is the live wire to the jump point (in the engine bay), bolted to the underside of the stud, so I can then bolt the live from the wiring harness to it?

Any help will be greatly appreciated