I just spotted that you must have edited your last question while I was writting a reply. So to answer the bit about using pre-wired relay sockets.
No harm in connecting the two blue/white wires together and then connecting to a single wire from the relay. But the single wire needs to be of a suitable size to take the load of two bulbs. i.e. 10 amps. (You could connect them together just behind the headlamp if you want and run a single wire to the relay). Same goes for the blue/red wires of course. Given that the relays are rated at 40amp I guess the wires from a pre-wired socket should be the same, but I don't know.
If you are using pre-wired relay sockets then you would connect the wires from the two 87 teminals together and then to the main feed wire. The relay wires would be taking 10 amps each, but as the relays are never both live (on) at the same time the main feed is also only ever taking 10 amps.
The reason I have two wires going to each relay terminal 30 is because I used pre-wired bulb sockets and it was easy to solder/crimp the two wires into a single female blade connector at the relay end.
Hope that helps and let us know how you get on.
No harm in connecting the two blue/white wires together and then connecting to a single wire from the relay. But the single wire needs to be of a suitable size to take the load of two bulbs. i.e. 10 amps. (You could connect them together just behind the headlamp if you want and run a single wire to the relay). Same goes for the blue/red wires of course. Given that the relays are rated at 40amp I guess the wires from a pre-wired socket should be the same, but I don't know.
If you are using pre-wired relay sockets then you would connect the wires from the two 87 teminals together and then to the main feed wire. The relay wires would be taking 10 amps each, but as the relays are never both live (on) at the same time the main feed is also only ever taking 10 amps.
The reason I have two wires going to each relay terminal 30 is because I used pre-wired bulb sockets and it was easy to solder/crimp the two wires into a single female blade connector at the relay end.
Hope that helps and let us know how you get on.