Installing XJ6 larger headlights, wiring?

[Robert_Wilkinson]

The extra wire is probably for a “city light.” I’m jealous! See thread below.

[xj] series 1 HEADLIGHT set-up

just swapped my front wings over with a second hand better pair the better wings came complete with headlamps, indicators etc so all I had to do was wire them to the existing harness indicators were simple but headlamps are not same wires as the old headlamps except there is an extra wire which I do not know where it goes to? its red, the old headlamp had three wires which the newer headlamp also has but this red wire is confusing me? any idead? if it helps I’ve noticed the new headlam…