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easiest thing to do is have a completely separate circuit for the extra lights.
terminals: (double check the diagram with the relay because this is off the top of my head. i always take a look at the diagram just to be sure)
30- battery to relay switch
87- from relay switch to lights
85- power for relay coil
86- ground for relay coil
wire the switch to an always-on power source (battery fuse block, etc) and run the other wire to terminal 85. flipping the switch puts current through the coil (85 to 86) and closes the relay switch, allowing current to flow from battery to lights through 30 and 87. the way i did my rear lights was the same principle, but a bit more complicated because i used a 6-terminal 3-position swtich to allow always on, on in reverse and always off options.